Mark M. answered • 12/08/17
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25,000 is -2σ
37,500 is +3σ
Look at your normal curve!
Jessica k.
asked • 12/08/17please helpstandard deviation
The mean lifetime of a certain tire is 30,000 miles and the standard deviation is 2500 miles.
If we assume nothing about the shape of the distribution, approximately what percentage of all such tires will last between
25,000 and 37,500 miles?
If we assume nothing about the shape of the distribution, approximately what percentage of all such tires will last between
25,000 and 37,500 miles?
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