Ledolter and Hogg report that a manufacturer of metal alloys is concerned about customer complaints regarding the lack of uniformity in the melting points of one of the firm’s alloy filaments. Fifty filaments are selected and their melting points determined. The following results were obtained:
(a) Construct a frequency distribution and display the histogram of the data.
(b) Calculate the sample mean and sample standard deviation.
(c) Locate x and x ± s, and x ± 2s on your histogram.
How many observations lie within one standard deviation of the mean? How many lie within two standard deviations of the mean?

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