Find the approximate value of the standard deviation of the data represented in the grouped frequency distribution
Question:
Find the approximate value of the standard deviation of the data represented in the grouped frequency distribution in Example 3.12.
Transcribed Image Text:
Cost of calls Midpoint (x) Frequency (f) fx x fx 5 and under 10 7.5 10 and under 15 12.5 15 and under 20 20 and under 25 17.5 22.5 25 and under 30 27.5 f = 23 150612 7.5 56.25 56.25 62.5 156.25 781.25 175.0 306.25 3062.50 135.0 506.25 3037.50 27.5 756.25 756.25 fx = 407.5 fx = 7693.75
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