Determine the mean and the standard deviation of the
Determine the mean and the standard deviation of the following frequency distribution.
Class
Frequency
20 up to 30
7
30 up to 40
12
40 up to 50
21
50 up to 60
18
60 up to 70
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determine the mean and the standard deviation of the following frequency distributionclassfrequency20 up to 30730 up to
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