In Exercises 29–32, find the mean of the data summarized in the given frequency distribution.
Also, compare the computed means to the actual means obtained by using the original list of data values, which are as follows: (Exercise 29) 35.9 years; (Exercise 30)
44.1 years; (Exercise 31) 84.4; (Exercise 32) 15.0 years.

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Years President Lived After First Inauguration 0-4 Frequency 8 5-9 2 10-14 5 15-19 7 20-24 4 25-29 6 30-34 0 35-39 1