The 50 measurements of acid rain in Wisconsin, whose histogram is given on page 23 are

(a) Calculate the median and quartiles.
(b) Find the 90th percentile.
(c) Determine the mean and standard deviation.
(d) Display the data in the form of a boxplot.

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3.58 3.80 4.0 4.01 4.05 4.05 4.12 4.18 4.20 4.2 4.27 4.28 4.30 4.32 4.33 4.35 4.35 4.41 4.42 4.45 4.45 4.50 4.50 4.50 4.50 4.51 4.52 4.52 4.52 4.57 4.58 4.60 4.61 4.61 4.62 4.62 4.65 4.70 4.70 4.70 4.70 4.72 4.78 4.78 4.80 5.075.20 5.26 5.41 5.48