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 6.4-in and a standard deviation of 0.9-in.

In what range would you expect to find the middle 50% of most head breadths?

Betweenand.

If you were to draw samples of size 45 from this population, in what range would you expect to find the middle 50% of most averages for the breadths of male heads in the sample?

Betweenand.

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