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OpenStudy (anonymous):
A certain brand of automobile tire has a mean life span of 39,000 miles and a standard deviation of 2450 miles (Assume the life spans have a bell shaped distribution) The life spans of three randomly selected tires are 35,000miles-37,000 miles- and 31,000 miles. What are their individual z scores?
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OpenStudy (anonymous):
most probability textbooks have a zscore table in the appendix.
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