Question:

If y + 2x = 10; 𝒙ഥ = 3 and Var (y) = 25, then C.V. of y is

A.

100%

B.

150%

C.

125%

D.

50%

Answer» c. 125%

Question:

The variance of first 5 natural numbers is

A.

3

B.

4

C.

8

D.

2

Answer» d. 2

Question:

If A and B be two mutually exclusive events and P(A) = 3/4; P (A U B) = 5/6 then P(B) is

A.

2/3

B.

3/5

C.

5/12

D.

1/12

Answer» d. 1/12

Question:

The Geometric Mean (G.M) for the series 1, 2, 4 is

A.

2

B.

7/3

C.

3/7

D.

2.5

Answer» a. 2

Question:

The necessary diagram to compare among the various components or between a partand the whole is:

A.

Bar diagram

B.

Step diagram

C.

Pie diagram

D.

Histogram

Answer» c. Pie diagram

Question:

The mean deviation about median of 28, 7, 16, 14, 24, 15, 34, 30 is

A.

8

B.

6

C.

10.5

D.

12

Answer» a. 8

Question:

If the odds against an event 3:5, the probability of that event is

A.

3/8

B.

5/8

C.

2/3

D.

1/3

Answer» b. 5/8

Question:

Two unbiased coins are tossed simultaneously. The problem of getting a head and atail is

A.

1/4

B.

1/2

C.

1

D.

¾

Answer» b. 1/2

Question:

The coefficient of skewness of a distribution is 0.4. Its S.D and mean are respectively 8and 30. The mode of the distribution is

A.

26

B.

26.2

C.

26.4

D.

26.8

Answer» d. 26.8

Question:

Consider the following data: Marks in 0 – 9 10 – 19 20 – 29 30 – 39 40 – 49 Total Mathematics No. of students (f) 10 8 12 15 5 50 Frequency density of the second class is

A.

0.8

B.

8

C.

1.2

D.

1

Answer» a. 0.8