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 6.1-in and a standard deviation of 0.8-in.

In what range would you expect to find the middle 68% of most head breadths?

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If you were to draw samples of size 30 from this population, in what range would you expect to find the middle 68% of most averages for the breadths of male heads in the sample?

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Enter your answers as numbers. Your answers should be accurate to 2 decimal places.