# Question

For the sample data presented in the dotplot of Exercise 3.63, construct a frequency distribution in which the classes are 10â€“under 20, 20â€“under 30, and 30â€“under 40. If this frequency distribution were all that we knew about the underlying data, what approximate values would be estimated for the mean and standard deviation of these data?
In exercise 3.63
A computer and statistical software will be desirable and useful. However, any necessary calculations can also be done with the aid of a pocket calculator. For readers using statistical software, keep in mind the file-naming keyâ€” for example, the data for Exercise 3.57 will be in data file XR03057.
In exercise

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