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. 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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