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Question

Which measure of dispersion ensures highest degree of reliability?

A
Range
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B
Mean deviation
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C
Standard deviation
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D
Quartile deviation
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Solution

The correct option is C Standard deviation
Standard deviation is the square root of the arithmetic mean of the squares of the deviations measured from the arithmetic mean of the data. It is considered as the best and most commonly used measure of dispersion to ensure high degree of reliability as it is a measure of average of deviations from the average.

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