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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