541. The mean deviation of the values, 18, 12, 15, is_______________?

A. 6
B. Zero
C. 3
D. 2

542. The variance of 5 numbers is 10. If each number is divided by 2, then variance of new number is_____________?

A. 20
B. 5
C. 2.5
D. 0

543. Mean deviation, Variance and Standard Deviation of the values 4,4,4,4,4,4 is_______________?

A. 4
B. 8
C. 2
D. 0

544. Arithmetic mean is _________ by change of origin and scale of measuremen

A.Vary
B. Negative
C. Affected
D. Not affected

545. The arithmetic mean _________ by 10 if 10 is added to all values?

A. Decease
B. Smaller
C. Largest
D. Increase

546. We must arrange the data before calculating ______________?

A. Mean
B. Median
C. Mode
D. G.M

547. Variance remains unchanged by change of_____________?

A. Origin
B. Scale
C. Both
D. None of these

548. If Y=-8X – 5 and SD of X is 3, then SD of Y is______________?

A. 8
B. 3
C. 24
D. None of these

549. If the standard deviation of the values 2,4,6,8 is 2.33, then the standard deviation of the values 4,6,8,10 is_____________?

A. 0
B. 2.58
C. 4.66
D. 2.33

550. Lowest value of variance can be____________?

A. 1
B. -1
C. 3
D. 0