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2. What is the range of the following data? 23, 45, 34, 21, 89, 45, 47, 91
A. 70
B. 56
C. 71
D. 69
7. ……. about a central value ‘a’ is the mean of the absolute values of the deviations of the observations from ‘a’.
A. Standard deviation
B. Quartile deviation
C. Range
D. Mean deviation
10. The arithmetic mean of the numerical values of the deviations of items from some average value is called the
A. Standard deviation
B. Mean deviation
C. Quartile deviation
D. Range
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