An important quality characteristic of water is the concentration of suspended solid material. Following are 60 measurements on suspended solids from a certain lake. Construct a stem-and-leaf diagram for this data and comment on any important features that you notice. Compute the sample mean, sample standard deviation, and the sample median.

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42.4 65.7 29.8 58.7 52.1 55.8 57.0 68.7 67.3 67.3 54.3 54.0 73.1 81.3 59.9 56.9 62.2 69.9 66.9 59.0 56.3 43.3 57.4 45.3 80.1 49.7 42.8 42.4 59.6 65.8 61.4 64.0 64.2 72.6 72.5 46.1 53.1 56.1 67.2 70.7 42.6 77.4 54.7 57.1 77.3 39.3 76.4 59.3 51.1 73.8 61.4 73.1 77.3 48.5 89.8 507 520 59.6 66.1 31.6