# Question

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.

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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