How Democratic is Georgia? County-by-county results are shown for a recent election. For your convenience, the data have been sorted in increasing order (Source: County and City Data Book, 12th edition, U.S. Census Bureau).
Percentage of Democratic Vote by County in Georgia

(a) Make a box-and-whisker plot of the data. Find the interquartile range.
(b) Grouped Data Make a frequency table using five classes. Then estimate the mean and sample standard deviation using the frequency table. Compute a 75% Chebyshev interval centered about the mean.
(c) If you have a statistical calculator or computer, use it to find the actual sample mean and sample standard deviation. Otherwise, use the values ˆ‘x = 2769 and ˆ‘x2 = 132,179 to compute the sample mean and sample standard deviation.

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