Life Span of Tires: A certain brand of
automobile tires has a mean life span of 35,000 miles and a
standard deviation or of 2,250 miles. (Assume a bell-shape
distribution).
The span of three randomly selected tires are 34,000 miles,
37,000 miles, and 31,000 miles. Find the z-scores that correspond
to each life span. Would any of these tires be considered
unusual?
The life spans of three randomly selected tires are 30,500
miles, 37,250 miles, and 35,000 miles. Using the...