Problem 5: Broadtred, Inc. makes automobile tires that have a mean life of 50,000 miles with a standard deviation of 2,500 miles. Using Excel functions (see Chapter 6), determine the following:
a.?What fraction of tires is expected to survive beyond 54,000 miles?
b.?What fraction will survive fewer than 56,000 miles?
c.?What length of warranty is needed so that no more than 2 percent of the tires will be expected to fail during the warranty period?
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