Determine the mean-standard deviation

Reference no: EM1395403

Determine the mean and the standard deviation of the following frequency distribution. (Round your answers to 2 decimal places.)

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 12

Reference no: EM1395403

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