Question:

The mean deviation of the observations 3, 5, 9, 1 and 2 about their median is

A.

2.4

B.

2.2

C.

3

D.

2.8

Answer» b. 2.2

Question:

If 𝝈𝒙 ൌ 𝟏𝟎, 𝝈𝒚 ൌ 𝟏𝟐, and bxy = – 0.8, then the value of correlation coefficient (r) is

A.

– 0.84

B.

– 0.96

C.

– 0.75

D.

0.86

Answer» b. – 0.96

Question:

The regression equation of y on x is 3x – 5y = – 12 and regression equation of x on y is2x – y = 7. The value of y when x = 10 is

A.

8.4

B.

6.5

C.

7

D.

9

Answer» a. 8.4

Question:

The basis of classification according to differences in time is called

A.

Ordinal classification

B.

Temporal classification

C.

Spatial classification

D.

Qualitative classification

Answer» a. Ordinal classification

Question:

The Harmonic Mean (H.M.) of the series 1, 2, 4 is

A.

5

B.

7

C.

7/5

D.

12/7

Answer» d. 12/7

Question:

Two dice are thrown simultaneously, the probability of obtaining a total sum 8 is

A.

1/6

B.

5/6

C.

5/36

D.

7/36

Answer» b. 5/6

Question:

The Standard Deviation (S.D) for 2 and 8 is 16

A.

5

B.

4

C.

3

D.

6

Answer» c. 3

Question:

If cov (x, y) = 0.6, 𝝈𝒙 ൌ 𝟐, 𝝈𝒚 ൌ 𝟏, then rxy is

A.

0.1

B.

0.3

C.

0.2

Answer» a. 0.1

Question:

The mode for the series 2, 5, 7, 6, 3, 7, 4, 7, 9, 2 is

A.

6

B.

2

C.

7

D.

9

Answer» c. 7

Question:

If Mean = 50 cm and C.V. = 60%, then the S.D. is

A.

25 cm

B.

30 cm

C.

28 cm

D.

20 cm

Answer» b. 30 cm