Question:

The Arithmetic Mean for the series 2, 6, 5, 7, 9, 4, 2 is

A.

7

B.

4

C.

5

D.

6

Answer» c. 5

Question:

The 1st and 3rd quartiles of a frequency distribution are respectively 25 and 45. If thecoefficient of skewness be – 0.1, then the median is

A.

36

B.

32

C.

24

D.

28

Answer» a. 36

Question:

For a given frequency distribution C.V = 30%, variance = 36 and Pearson’s Coefficientof Skewness = – 0.25, the mode of the distribution is

A.

24

B.

20

C.

21.5

D.

24.5

Answer» c. 21.5

Question:

Two variables x and y are given by the relation y = 3x – 2. If the mode of x be 5, themode of y will be

A.

13

B.

10

C.

15

D.

9

Answer» a. 13

Question:

If for a symmetrical distribution 1st and 3rd quartiles are respectively 16 and 22, then theMedian of the distribution is

A.

20

B.

18

C.

24

D.

19

Answer» d. 19

Question:

The A.M. of the numbers 1, 3, 5, ……. (2n – 1) is

A.

n2

B.

n + 1

C.

n

D.

2n

Answer» c. n

Question:

The A.M of first n natural numbers is 6. The value of n is

A.

12

B.

9

C.

11

D.

16

Answer» c. 11

Question:

If two regression equations x + 5y = 13 and 3x – 2y = 5, then the mean values of x andy are respectively.

A.

(2, 3)

B.

(3, 2)

C.

(4, 5)

D.

(5, 4)

Answer» b. (3, 2)

Question:

For a frequency distribution mean = 68.2; median = 69 and coefficient of skewness ofthe distribution is – 0.6. The variance of the distribution is

A.

9

B.

25

C.

36

D.

16

Answer» d. 16

Question:

For two mutually exclusive events A and B, P (A U B) is equal:

A.

P(A) – P(B)

B.

P(A) + P(B)

C.

½ [P(A) + P(B)]

D.

P(A) x P(B)

Answer» b. P(A) + P(B)