The following is a sample of 25 measurements.

a. Compute x, s2, and s for this sample.

b. Count the number of measurements in the intervals x { s, x { 2s, and x { 3s. Express each count as a percentage of the total number of measurements.

c. Compare the percentages found in part b with the percentages given by the empirical rule and Chebyshev’s rule.

d. Calculate the range and use it to obtain a rough approximation for s. Does the result compare favorably with the actual value for s found in part a?

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7 6 6 11 8 9 11 9 10 8 7 7 5 9 10 7 7 7 7 9 12 10 10 8 6