Question: Find the semi-interquartile range for the data in Example 3.15. The lower quartile monthly cost of calls is 10 and the upper quartile monthly cost

Find the semi-interquartile range for the data in Example 3.15.

The lower quartile monthly cost of calls is £10 and the upper quartile monthly cost of calls is £24.5.

SIQR = (£24.5 – £10)/2 = £14.5/2 = £7.25

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