13 Jun ASSUME THE LIFE SPANS OF THE TIRES HAVE A BELL-SHAPED DISTRIBUTION.
A certain brand of automobile tire has a mean life span of 34000 miles and a standard deviation of 2200 miles. (Assume the life spans of the tires have a bell-shaped distribution.) (a) The life spans of three randomly selected tires are 33000 miles, 36000 miles, and 31000 miles. Find the z-score that corresponds to each life span. For the life span of 33000 miles, z-score is
. (Round to the nearest hundredth as needed.)
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