The frequency distribution for the values of resistance in ohms of 56 resistors is as shown. Calculate the standard deviation from the mean of the resistors, correct to 4 significant figures. Draw histogram. 20.5-20.9 21.0-21.4 15 21.5-21.9 11 22.0-22.4 14 22.5-22.9 9 23.0-23.4 2

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