11-15. A major department store chain is having a sale on refrigerators. The number of refrigerators sold

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11-15. A major department store chain is having a sale on refrigerators. The number of refrigerators sold during this sale at a sample of ten stores was:

80 110 0 40 70 80 100 50 80 30

a. What are the mean, mode, and median? Which measure of central tendency is most appropriate in this case and why?

b. What are the variance and the standard deviation?

c. Construct a histogram, and discuss whether this variable is normally distributed.

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