The accompanying graph is a histogram of ages of U.S. presidents at the time they were inaugurated (from Data Set 12 in Appendix B).
a. Identify two features of the vertical scale that cause the graph to be somewhat misleading.
b. Does the histogram appear to show data from a population having a normal distribution? Explain.
c. From the graph, identify the lowest and highest possible ages, then use the range rule of thumb to estimate the standard deviation of the ages. How does the result compare to the standard deviation of 6.6 years calculated from the original list of sample values?

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21 5 17 13 44 52 56 60 Age of President at Inauguration 48 64 68