Find the mean from the following chart: class              frequency 31-33                 18 34-36                 18 37-39                 10 40-42                15 43-45                 5

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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

Approved by eNotes Editorial Team