The following annual total rainfall data for Houston Intercontinental Airport were collected over a 21-yr period

(a) Compute the mean, variance, and the skewness coefficient
(b) Plot a histogram using 5-in. intervals.
(c) Fit the data with the normal distribution. Sketch the normal PDF on the histogram of part (b), scaling such that the areas under the histogram and under the PDF are the same (e.g., see Figure 3-15).
(d) Find the value of the 10-yr annual rainfall total.
(e) Which year's most closely representing the mean annual and 10-yr rainfalls for Houston?

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