The lengths (in cm) of metal rods were recorded in the following inclusive class intervals

MATHEMATICS · Subjective · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation

Problem

The lengths (in cm) of metal rods were recorded in the following inclusive class intervals. Length (cm) 50–59 60–69 70–79 80–89 90–99 Frequency   3   7   10   5   5 a) Convert the class intervals to continuous form. b) Calculate the population standard deviation of the rod lengths.

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