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Find the? z-score that corresponds to life span

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Reference no: EM132852861

A certain brand of automobile tire has a mean life span of 39,000 miles and a standard deviation of 2,450 miles.? (Assume the life spans of the tires have a? bell-shaped distribution.)

?(a) The life spans of three randomly selected tires are 35,000 ?miles, 38,000 ?miles, and 32,000 miles. Find the? z-score that corresponds to each life span.

For the life span of 35,000 ?miles, z-score is _____

?(Round to the nearest hundredth as? needed.)

For the life span of 38,000 ?miles, z-score is _____

?(Round to the nearest hundredth as? needed.)

For the life span of 32,000 ?miles, z-score is ______

?(Round to the nearest hundredth as? needed.)

According to the? z-scores, would the life spans of any of these tires be considered? unusual?

Yes or No?

Reference no: EM132852861

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