b. The frequency distribution for the values of resistance in ohms of 48 resistors is as shown. Calculate the standard deviation from the mean of the resistors, correct to 3 significant figures. class frequency 20.5-20.9 3 21.0-21.4 10 21.5-21.9 11 22.0-22.4 13 22.5-22.9 9 23.0-23.4 2 Draw an ogive for this data and hence determine the quartile values.

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