Question: Consider the following grouped sample data: Values Frequency 10 to under 30 26 30 to under 50 . 35 50 to under 70

Consider the following grouped sample data:

Values                         Frequency

10 to under 30 ……………    26

30 to under 50 …………….   35

50 to under 70 ……………    51

70 to under 90 …………….   33

a. Calculate the approximate mean of these sample data.

b. Calculate the approximate standard deviation of these sample data.

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