Find the z-score for 9 - of the following set of numbers (7, 9, 9, 9, 10, 11, 12, 12, 14, 14 ).

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The mean of the given 10 values is 10.7. The variance is 2.405 and the standard deviation=1.55 approx.

The Z score for 9 is (9-10.7)/1.55=-1.096 approx. (This corresponds to 0.1393 or 13.93%.)

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