GMAT Preparation Online | GMAT Statistics Practice Question #14 | Standard Deviation Practice Question
A GMAT 650 to 700 level medium difficulty problem solving practice question in standard deviation. The question helps consolidate the idea of finding observations that lie within one standard deviation of the mean.

Question
Consider the following set of numbers : 50, 40 ,10, 20, 60, 30 ,70, 90, 80.
How many of these observations lie within one standard deviation of the mean?

The solution to the question includes the steps to compute mean for numbers that are in AP, as is the case with the set of numbers given and the steps to compute the standard deviation.

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