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I understand how to calculate the mean by hand & by the calculator for most circumstances. What I don't is when there are classes, for example

Class Frequency

10-19 8

20-29 16

30-39 21

40-49 11

50-59 4

Now, I can compute the approximate mean by hand with the formula in the book. The answer gives a mean = 32.83 & a standard deviation = 11.06. The answer checks with the back of the book. How can I place this information into the ti-86 & get the same results?