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The length of a iron bar is measured by a number of different observers and the following set of 12 measurements are recorded (units mm)

The length of a iron bar is measured by a number of different observers and the following set of 12 measurements are recorded (units mm) 302,304,303,305,307,309,310,311,312,301,303,302. Find the values of mean, median, variance and standard deviation.

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