6-21. In an attempt to measure the effects of acid rain, research- ers measured the pH (7 is neutral and values below 7 are acidic) of water collected from rain in Ingham County, Michigan. 5.47 5.37 5.38 4.63 5.37 3.74 3.71 4.96 4.64 5.11 5.65 5.39 4.16 5.62 4.57 4.64 5.48 4.57 4.57 4.51 4.86 4.56 4.61 4.32 3.98 5.70 4.15 3.98 5.65 3.10 5.04 4.62 4.51 4.34 4.16 4.64 5.12 3.71 4.64 5.59 (a) Find the sample mean and sample standard deviation of these measurements.

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