86 Characteristics of a rockfall . Refer to the Environmental Geology (Vol. 58, 2009) study of how far a block from a collapsing rock wall will bounce, Exercise 59 . The rebound lengths (meters) for a sample of 13 rock bounces are reproduced in the table below and saved in the ROCKFALL file.

a. Compute the range of the 13 rebound lengths. Give the units of measurement of the range.

b. Compute the variance of the 13 rebound lengths. Give the units of measurement of the variance.

c. Compute the standard deviation of the 13 rebound lengths. Give the units of measurement of the standard deviation.

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10.94 13.71 11.38 7.26 17.83 11.92 11.87 5.44 13.35 4.90 5.85 5.10 6.77 Based on Paronuzzi, P. "Rockfall-induced block propagation on a soil slope, northern Italy." Environmental Geology, Vol. 58, 2009 (Table 2).