**741. The mean deviation of the scores 12, 15, 18 is:**

A.6

B.0

C.3**D. 2**

**742. The variance is zero only if all observations are the:**

A.Different

B.Square

C.Square root**D.Same**

**743. The standard deviation of -5, -5, -5, -5, 5 is:**

A.-5

B.+5**C.0**

D.-25

**744. The measures used to calculate the variation present among the observations relative to their average is called:**

A.Coefficient of kurtosis

B.Absolute measures of dispersion

C.Quartile deviation**D.Relative measures of dispersion**

**745. If there are many extreme scores on all examination, the dispersion is:****A.Large**

B.Small

C.Normal

D.Symmetric

**746. In quality control of manufactured items, the most common measure of** dispersion is:**A.Range**

B.Average deviation

C.Standard deviation

D.Quartile deviation

**747. If Y = aX ± b, where a and b are any two numbers and a ∦ 0, then the range of Y values will be:**

A.Range(X)

B.a range(X) + b

C.a range(X) – b**D.∣a∣ range(X)**

**748. Which measure of dispersion can be computed in case of open-end classes?**

A.Standard deviation

B.Range**C.Quartile deviation**

D.Coefficient of variation

**749. If Y = aX ± b, where a and b are any two numbers but a ∦ 0, then M.D(Y) is equal to:**

A.M.D(X)

B.M.D(X) ± b**C.∣a∣ M.D(X)**

D.M.D(Y) + M.D(X)

**750. If the dispersion is small, the standard deviation is:**

A.Large

B.Zero**C.Small**

D.Negative

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