At a constant amplitude completely reversed bending
At a constant amplitude, completely reversed bending stress level, the cycles-to-failure experience with 69 specimens of 5160H steel from 1.25-in hexagonal bar stock was as follows:

Where L is the life in thousands of cycles, and f is the class frequency of failures.
(a) Construct a histogram with class frequency f as ordinate.
(b) Estimate the mean and standard deviation of the life for the population from which the sample was drawn.
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