The question has been edited as you can ask only one question at a time.

To determine the mean from the given frequency table first determine the mid point of each interval.

interval frequency mid point

31-33 18 32

34-36 18 35

37-39 10 38

40-42 15 41

43-45 5 ...

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The question has been edited as you can ask only one question at a time.

To determine the mean from the given frequency table first determine the mid point of each interval.

interval frequency mid point

31-33 18 32

34-36 18 35

37-39 10 38

40-42 15 41

43-45 5 44

Multiply the mid point with the frequency and add the resulting product for each interval.

The sum is 32*18 + 35*18 + 38*10 + 41*15 + 44*5 = 2421

Divide the sum determined earlier by the sum of the frequency for each interval; which is 18+18+10+15+5 = 66.

The mean is 2421/66 = 36.6818

**The mean of the values given in the table is 36.6818**