Dave s Automatic Door referred to in Exercise 37 installs automatic
Dave’s Automatic Door, referred to in Exercise 37, installs automatic garage door openers.
Based on a sample, following are the times, in minutes, required to install 10 door openers: 28, 32, 24, 46, 44, 40, 54, 38, 32, and 42.
a. Compute the sample variance.
b. Determine the sample standard deviation.

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