**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

**NOTEIF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.THANK YOU**