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Category > Statistics Posted 23 Jun 2017 My Price 3.00

Life Spans of Tires

41.    Life Spans of Tires A certain brand of automobile tire has a mean life span of 35,000 miles, with a standard deviation of 2250 miles. (Assume the life spans of the tires have a bell-shaped distribution.)

(a)     The life spans of three randomly selected tires are 34,000  miles, 37,000 miles, and 30,000 miles. Find the z-score that corresponds to each life span. According to the z-scores, would the life spans of any of these tires be considered unusual?

(b)     The life spans of three randomly selected tires are 30,500  miles, 37,250 miles, and 35,000 miles. Using the Empirical Rule, find the percentile that corresponds to each life span.

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Alpha Geek
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Status NEW Posted 23 Jun 2017 07:06 AM My Price 3.00

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file 1498204047-Answer.docx preview (78 words )
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