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Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined...

Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.3-in and a standard deviation of 0.9-in.

In what range would you expect to find the middle 98% of most head breadths?

If you were to draw samples of size 45 from this population, in what range would you expect to find the middle 98% of most averages for the breadths of male heads in the sample?

Math   Statistics-And-Probability   
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