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 inches and a standard deviation of 0 8 inches In what range would we expect to find the middle 39 of most head breadths Round the answer to two decimal places Between 6 10 and 6 50 Between If we were to draw samples of size 55 from this population in what range would you expect to find the middle 39 of most averages for the breadths of male heads in the sample Round the answer to two decimal places inches and inches