511. The sum of the squares of deviations is the least when measured from____________?

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

512. Mean deviation =______ S.D?

A. 2/3
B. 4/5
C. 5/6
D. 6/5

513. Standard deviation is always calculated from _____________?

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

514. suppose for 40 observation, the variance is 50. If all the observation are increased by 20, the variance of these increased observation will be_________?

A. 50
B. 70
C. 50/20
D. 50-20=30

515. The second moment about mean is _____?

A. Variance
B. Mean
C. S.D.
D. Mode

516. The ________ in the distribution around which the observation to lie?

A. Mean
B. Dispersion
C. Manner
D. Central value

517. The value of interval x ± S include _______________?

A. 49.45%
B. 95.45%
C. 68.27%
D. 99.73%

518. First moment about origin is always equal to _______________?

A. A.M.
B. variance
C. Zero
D. None of these

519. The sum of powers of deviation from mean is zero is called __________?

A. Mean
B. Lack
C. Normal
D. Skewed

520. If Skewed distribution the three averages mean, median and mode are ________?

A. Identical
B. Different
C. Zero
D. None of these


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