24.79

23.79

25.79

26.79

Hide Answer Workspace

**Answer:** Option

c

**Explanation:**

Here,
first, we need to find mean

=
31+97+112+12= 315/5 = 63

**Standard
deviation** =
[1/n (x(n)-mean)^{2}]^{0.5}

=
25.79

2)
Find the mode of the call received on 7 consecutive day 11,13,13,17,19,23,25

11

13

17

23

Hide Answer Workspace

**Answer:** Option b

**Explanation:** Mode = The value that
appears most frequent; here, the number 13 repeated twice.

3)
Find the median of the call received on 7 consecutive days 11,13, 17, 13,
23,25,19

13

23

25

17

Hide Answer Workspace

**Answer:** Option d

**Explanation:**

Where,

n
= number of terms = 7

The
median is the middle value of the data sets, so first, we need to arrange the
number in ascending order 11,13,13,17,19,23,25

the
middle one is 7+1/2 = 4^{th} number

so,
the 4^{th} number is 17

4)
Find the mode and median of the 9 consecutive number 12,7,8,14,21,23,27,7,11

12,9

7,9

7,12

11,9

Hide Answer Workspace

**Answer:** Option c

**Explanation:** Mode = The value that
appears most frequent = 7 which is repeated twice. And,

Where
n = number of terms = 9

The
median is the middle value of the data sets, so first, we need to arrange the
number in ascending order 7,7,8,11,12,14,21,23,27

the
middle one is 9+1/2 = 5^{th} number

so,
the 5^{th} number is 12

5)
When the Mean of a number is 18, what is the Mean of the sampling distribution?

21

18

27

23

Hide Answer Workspace

**Answer:** Option b

**Explanation:** In sampling
distribution, the Mean of a number is equal to the Mean of the sampling
distribution; hence the Mean of the number is 18 the Mean of the sampling
distribution is 18.

6)
If the probability of hitting an object is 0.8, find the variance

0.18

0.16

0.14

0.12

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

Given,

P
= 0.8

q
= 1-p

=
1 - 0.8

=0.2

Therefore,
mean = q = 0.2

And
we know that variance = **pq** = (0.2) (0.8) = 0.16

7)
If the probability that an object dropped from a certain height will strike the
ground is 80 percent and if 12 objects are dropped from the same place, find
the mean and variance.

9.6,1.92

8.6,1.92

9.6,1.82

8.6,1.82

Hide Answer Workspace

**Answer:** Option q

**Explanation:**

Given,

p=
80% = 0.8 and q = 1-p = 20% = 0.2 and n= 12

Therefore,

**Mean**= np = (12)(0.8) = 9.6

And,

**Variance** = npq = (9.6)(0.2)= 1.92

8)
Find the mean of tossing 4 coins

1

2

3

4

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

Here,
p = ½ and q = ½

N
= 4

Therefore, **Mean** = **np** =
4*1/2 = 2

9)
Variance of a constant 'x' is

0

x/2

x

1

Hide Answer Workspace

**Answer:** Option a

**Explanation:**

We
know that, V(a) = **E (x ^{2}) - (E(a)^{2})**

=
x^{2}- x^{2} = 0

10)
E(X) = λ is used for which distribution?

Binomial distribution

Poisson's distribution

Bernoulli's distribution

Laplace distribution

Hide Answer Workspace

**Answer:** Option b

**Explanation:** In Poisson's
distribution, a positive constant called λ is used, which is the mean and
variance of the distribution. The Poisson distribution predicts how many of a
certain type of event will occur in a bounded area or during a given period,
provided that the events occur independently and cannot occur simultaneously.
The events are sometimes called "outcomes" or "observed
occurrences."

11)
The Mean of a constant 'x' is

0

x/2

x

1

Hide Answer Workspace

**Answer:** Option c

**Explanation:** The mean of the constant
x is x.

12)
If P(x) = 0.8 and x = 3, then find the value of E(x)

2.6

2.8

2.2

2.4

Hide Answer Workspace

**Answer:** Option d

**Explanation:** We know that, E(x) = x
P(x) = 0.8*3 = 2.4

13)
If P (1) = P (2) in Poisson's distribution, find the value of mean

Hide Answer Workspace

**Answer:** Option a

**Explanation:** We know the formula of
Poisson's distribution,

14)
If P (1) = λ P (5) in Poisson's distribution, find the value of mean

33.81

53.81

63.81

43.81

Hide Answer Workspace

**Answer:** Option d

**Explanation:** We know the formula of
Poisson's distribution,

15)
Find the expectation of random variable a?

5.71

4.71

6.71

8.71

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

We
know that,

E(X)
= 0(1/7) + 1(2/7) + 2 (3/7) + 3(4/7) + 4(5/7)

0
+ 2/7 + 6/7 + 12/7 + 20/7

=
5.71

16)
If K is the Mean of Poisson distribution, then the variance is given by

K/2

K

K^{2}

K^{1/2}

Hide Answer Workspace

**Answer:** Option b

**Explanation:** For a discrete
probability distribution, the variance is given by the following equation

17)
If K is the Mean of Poisson distribution, then the standard deviation is given
by

√k

K^{2}

K

k/2

Hide Answer Workspace

**Answer:** Option a

**Explanation:** A Poisson distribution
with mean k is given by Variance = k

Therefore,

Standard
Deviation = √variance = √k

18)
Find the arithmetic mean of the set of data: 6,1,5,8, and 10

4

5

6

7

Hide Answer Workspace

**Answer:** Option c

**Explanation:** If we want to calculate
the AM, we need to find the total number in the data set. In the given
question, total number = 5

19)
Calculate the geometric Mean of 1,3,9,3

1

2

3

4

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

In
the given question, the total number is 4, so by using the formula to determine
the geometric Mean, we have,

**G.M** = (1×3×9×3)^{1/4}

=
(81)^{1/4}

=
(3^{4})^{1/4}

=
3

20)
Find the variance of the given data set: 3,9,5,6,7

1

2

3

4

Hide Answer Workspace

**Answer:** Option d

**Explanation:** If we want to calculate
the variance, the first thing you need to do is find the Mean of the given data
set,

Therefore,

Then,
we need to find the Variance V = (3-6)^{2} + (9-6)^{2} +
(5-6)^{2} + (6-6)^{2} + (7-6)^{2}/5

=
9+9+1+0+1 /5 = 20/5 = 4

21)
Find the mean, mode and median of the given sets of data: 5,8,12,17,12,14,6,8,
12, and 10

11,12,10

10,12,13

11,12,13

10,12,11

Hide Answer Workspace

**Answer:** Option d

**Explanation:**

**Mean** =
(5+8+12+13+12+14+6+8+12+10)/ 10 = 10

**Mode** = Mode is the most
repeated value of the given data set.

=
12 (12 repeated 3 times in the set of data)

For
median, first we need to arrange the value in ascending order in the given data
set: 5,6,8,8,10,12,12,12,14,17. Here, the numbers 10 and 12 are the middle
values. The average of the given number is 12+10/2 = 11. Hence, 11 is the
median for the given data set. So, the value of Mean, mode, and median are
10,12,11

22)
Find the mean mode and median of the messages received on 7 consecutive days
7,13,5,9,6,5,10

7,8,9

8,9,9

8,8,9

6,8,9

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

**Mean** = (9+13+5+9+6+5+9)/7 =
56/7 = 8

**Mode** = Mode is the most
repeated value of the given data set. = 9 (repeated 3 times in the set of data)

For
median, first, we need to arrange the value in ascending order in the given
data set: 5,5,6,9,9,9,13. Here, the number 9 is placed in the middle. Hence, 9
is the median for the given data set. So, the value of Mean, mode, and median
are 8,9,9

23)
Calculate the range of the given sets of data 7,47,8,42,47,95,42,96,2

6

94

71

84

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

**Range
= Maximum Value - Minimum Value**

Here,
Maximum value in the data sets = 96, and Minimum value = 2

Therefore, **Range** =
96-2 = 94

24)
Find the mean deviation according to the Mean of the given data sets
7,47,8,42,47,95,42,96,3

11

111

112

113

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

If
we want to calculate the mean deviation according to the Mean. First, we need
to calculate the Mean of the given data sets

Therefore, **Mean** =
7+47+8+42+47+95+42+96+3/9 = 43

Now,
we need to find the deviation to calculate mean deviation i.e.,

(43-7)
+(47-43) +(43-8) +(43-42) +(47-43) +( 95-47) +(43-42) +(96-43) +(43-3) = 222

So,

25)
Find the mean deviation according to median of the given data sets
7,47,8,42,47,95,42,96,3

99

100

101

102

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

If
we want to calculate the mean deviation according to the median, first, we need
to calculate the median of the given data sets

Therefore,
to calculate the median, first, we need to arrange the number in ascending
order 3,7,8,42,42,47,47,95,96

SO, **Median** =
42

Now,
we need to find the deviation to calculate mean deviation according to median
i.e.,

(42-3)
+(47-7) +(42-8) +(42-42) +(42-42) +( 47-42) +(47-42) +(95-42) +(96-42) =

So,

26)
Find the variance of the given data sets 7,47,8,42,47,95,42,96,3

1028.78

1018.78

1029.78

1019.78

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

If
we want to calculate the variance, first, we need to calculate the Mean of the
given data sets

Therefore, **Mean** =
7+47+8+42+47+95+42+96+3/9 = 43

Now,
we need to find the square of deviation to calculate variance i.e.,

(43-7)^{2} +(47-43)^{2} +(43-8)^{2} +(43-42)^{2}+(47-43)^{2} +(
95-47)^{2} +(43-42)^{2} +(96-43)^{2}+(43-3)^{2} =

=1296+16+1225+1+16+2304+1+2809+1600

=9268

So,

27)
Find the standard deviation of the given data sets 7,47,8,42,47,95,42,96,3

29.09

30.09

31.09

32.09

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

If
we want to calculate the standard deviation, first, we need to calculate the
Mean of the given data sets

Therefore**,
Mean** = 7+47+8+42+47+95+42+96+3/9 = 43

Now,
we need to find the square root to calculate the variance i.e.,

(43-7)^{2} +(47-43)^{2} +(43-8)^{2} +(43-42)^{2}+(47-43)^{2} +(
95-47)^{2} +(43-42)^{2} +(96-43)^{2}+(43-3)^{2} =

=1296+16+1225+1+16+2304+1+2809+1600

=9268

28)
Find the coefficient of variation of the given data sets 7,47,8,42,47,95,42,96,3

72.64

74.62

30.39

78.58

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

If
we want to calculate the coefficient, we need to calculate the Mean of the
given data sets.

Therefore,

**Mean** =
7+47+8+42+47+95+42+96+3/9 = 43

Now,
we need to find the square root to calculate the variance i.e.,

(43-7)^{2} +(47-43)^{2} +(43-8)^{2} +(43-42)^{2}+(47-43)^{2} +(
95-47)^{2} +(43-42)^{2} +(96-43)^{2}+(43-3)^{2} =

=1296+16+1225+1+16+2304+1+2809+1600

=9268

So,

29)
Find the value of λ in Poisson's distribution if the probability of getting a
tail in a biased coin toss is ¼ when 8 coins are tossed.

2

3

1

4

Hide Answer Workspace

**Answer:** Option a

**Explanation:**

Given,

Probability
(P) = ¼

And
we know that,

**λ
= np** =
(8) × ¼ = 2

30)
The Mean of a random variable K is given by equation

E(K)

(EK)^{2}

E^{2} - K^{2}

None of these

Hide Answer Workspace

**Answer:** Option a

**Explanation:** The Mean of any data
sets refers to the sum of the function in its domain multiplied with random
variables' value. Therefore, the Mean is given by E(K), where k is a random
variable.

31)
Find the Mean of a constant k

K

k/2

k^{2}

1

Hide Answer Workspace

**Answer:** Option a

**Explanation:**

Let
f(x) be the random variable of the given function X

Now,
E(k) = ∫kf(x)

=
kf(x)

=
k(1) = k

32)
Find the Variance of the constant 'K'

1

0

K^{2}

K/2

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

**Variance
(V) = E(k ^{2}) - (E(K))^{2}**

= **k ^{2}-
k^{2}** = 0

33)
Find the variance in a Binomial Distribution, if x, y, and z are the
probability of getting success, failure, and a number of trials, respectively.

xyz

x^{2}yz

xy^{2}z

x^{2}y^{2}z^{2}

Hide Answer Workspace

**Answer:** Option a

**Explanation:** If we consider a
discrete function, the variance is given by the following equation

If
we consider a discrete function, the variance is given by the following
equation

**Variance(V)
= ∑ _{(x=0)}^{Z}x^{2} X(x) - µ^{2}**

Here,

µ
= Mean

When
we substitute X(x) = z_{Cx} X^{x} y^{(z-x)} in
the above equation and µ = zx we get

**Variance** = xyz.

34)
Poisson distribution is applied for

Regular Random Variable

Constant time function

Discrete Random Variable

Irregular Random Variable

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

Poisson
distribution is usually applied for discrete random variables along with
Binomial distribution. The Poisson distribution expresses the probability of a
given number of events occurring in a fixed interval of time and space if these
events occur with a known average rate and independently since the last event.

As
a result, the distribution is often used in counting processes where the
average rate of the events happening is known, and individual events occur
independently of each other.

35)
If P (1) = λ P (2) in Poisson's distribution, find the value of mean

2

5

6

7

Hide Answer Workspace

**Answer:** Option a

**Explanation:** We know the formula of
Poisson's distribution,

36)
calculate the mean the given data set: 3,8,12,17,16,14,6,8, 16, and 10

11

12

13

14

Hide Answer Workspace

**Answer:** Option a

**Explanation:**

**Mean** = Total sum of the
number of given data sets/ Total number in data sets

(3+8+12+17+16+14+6+8+16+10)/
10 = 11

37)
Find the mode of the given data set: 5,8,12,17,12,12,6,8, 12, and 12

8

5

12

17

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

**Mode** = Mode is the most
repeated value of the given data set.

=
12 (12 repeated 5 times in the set of data)

38)
Find the median of the given data set: 5,8,12,17,2,14,6,8, 13, and 7

5

2

8

Hide Answer Workspace

**Answer:** Option c

**Explanation:** For median, first, we
need to arrange the value in ascending order in the given data set: 2,5, 6,7,
8,8,12,13,14,17. Here, the numbers 8 and 8 are the middle values. The average
of the given number is 8+8/2 = 8. Hence, 8 is the median for the given data
set.

39)
If the probability of hitting a target is 0.4, find the mean and variance

0.6,0.28

0.6,0.24

0.8, 0.22

0.8, 0.20

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

Given,

**Probability** P = 0.4

q
= 1-p

=
1 - 0.4

=0.6

Therefore, **Mean** =
q = 0.6

And
we know that **Variance = pq** = (0.4) (0.6) = 0.24

40)
Find the arithmetic mean of the set of data: 9,11,10,10,5,15and 10

11

1

10

13

Hide Answer Workspace

**Answer:** Option d

**Explanation:** If we want to calculate
the AM, we need to find the total number in the data set. In the given
question, total number = 7

41)
Calculate the variance of the given data set: 4,7,6,3,7,3

2

4

6

8

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

If
we want to calculate the variance, first we need to find the Mean of the given
data set,

Therefore,

Then,
we need to find the **Variance (V)** = (5-4)^{2} + (7-5)^{2} +
(6-5)^{2} + (5-3)^{2} + (7-5)^{2} +
(5-3)^{2}/6

=
1 + 4 + 1 + 4 + 4 +4/6 = 18/3 = 6

42)
If K denotes the expectation, the variance of a random variable X is denoted
as?

(K(X)^{2})

2K(X)

K(X^{2}) - (K(X)^{2})

K(X)^{2}

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

According
to the property of Expectation

**Variance
V(X)** =
K(X^{2}) - (K(X))^{2}

43)
If K is a variance between 0 and 4. Find the value of K(X2)

32

64

27

9

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

Integrating
f(x) = X^{2} from 0 and 4 we get the value of K(X^{2}) =
64

44)
Find the median of the run made by a player in 5 T20 matches, 55,44, 21, 35,
45.

55

51

45

44

Hide Answer Workspace

**Answer:** Option d

**Explanation:**

Where
n = number of terms = 5

The
median is the middle value of the data sets, so first, we need to arrange the
number in ascending order 21,35,44,45,55

the
middle one is 5+1/2 = 3rd number

so,
the 3rd number is 44

45)
Find the standard deviation of the given data sets 7,2,8,11,6,13,16

4.64

4.34

2.34

3.64

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

If
we want to calculate the standard deviation, first, we need to calculate the
Mean of the given data sets

Therefore, **Mean** =
7+2+8+11+6+13+16/7 = 63/7 = 9

Now,
we need to find the square root to calculate the variance = (Mean - each number
of data sets)^{2}

i.e.,

(9-7)^{2} +(9-2)^{2} +(9-8)^{2} +(9-11)^{2}+(9-6)^{2} +(
13-9)^{2} +(16--9)^{2}

=4
+ 49 + 1 + 4 + 9 + 16 + 49

=132

So,

46)
Find the coefficient of the given data sets 7,2,8,11,6,13,16

48.64

43.34

42.34

48.22

Hide Answer Workspace

**Answer:** Option d

**Explanation:**

If
we want to calculate the standard deviation, first, we need to calculate the
Mean of the given data sets

Therefore, **Mean** =
7+2+8+11+6+13+16/7 = 63/7 = 9

Now,
we need to find the square root to calculate the variance = (Mean - each number
of data sets)^{2}

i.e.,

(9-7)^{2} +(9-2)^{2} +(9-8)^{2} +(9-11)^{2}+(9-6)^{2} +(
13-9)^{2} +(16--9)^{2}

=4
+ 49 + 1 + 4 + 9 + 16 + 49

=132

So,

47)
The random variables of A and B have variances 0.4 and 0.6, respectively, and K
= 4A - 2B. Find the value of K

2.2

4.4

6.6

8.8

Hide Answer Workspace

**Answer:** Option d

**Explanation:**

Given

**Variance
(A)** =
0.4 and Variance (B) = 0.6

And
K = 4A - 2B

Therefore,

Var(K)
= Var(4A - 2B)

=
Var(4A) + Var(2B)

=
16 Var(A) + 4 Var(B)

Var(K)
= 16*0.4 + 4*0.6

=
8.8

48)
The mean value of the Hypergeometric distribution is given by the equation

E(X) = n*k/N^{2}

E(X) = n*k/N-1

E(X) = n*k/N

E(X) = n*k/N^{3}

Hide Answer Workspace

**Answer:** Option c

**Explanation:**

The
equation gives the Mean of the Hypergeometric distribution

**E(X)
= n*k/N**

Where,

N
denotes the number of trails

K
denotes the number of success

And,
N denotes the sample size

49)
The Variance of the Hypergeometric distribution is given by the equation

n* k (N-k)*(N-n)/[N^{2}*(N-1)]

n* k (N-k)*(N-n)/[N^{3}*(N-P)]

n* k (N-1)*(N^{2}-n)/[N^{2}*(N-1)]

n* k (N-k)*(N^{2}-n)/[N^{3}*(N-1)]

Hide Answer Workspace

**Answer:** Option a

**Explanation:**

The
variance of the Hypergeometric distribution is given by n* k (N-k)*(N-n)/[N^{2}*(N-1)].

Where,

n
denotes the number of trails

K
denotes the number of success

An,
N denotes the sample size.

50)
Find the range of the following data sets 61,22,34,17,81,99,42,94.

81

82

83

84

Hide Answer Workspace

**Answer:** Option b

**Explanation:**

We
know that,

**Range
= Maximum Value - Minimum Value**

Here,
Maximum value in the data sets = 99, and Minimum value = 17

Therefore,
Range = 99-17= 82

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