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A time-study analyst observed a packaging operation and collected the following items (in seconds) required for the operation to fill packages of a fixed volume

A time-study analyst observed a packaging operation and collected the following items (in seconds) required for the operation to fill packages of a fixed volume box: 11, 12, 15, 18, 13, 18, 16, 14, 12 and 17. Find the range, variance, standard deviation for sample and Population.

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