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 5.8 inches and a standard deviation of 1.2 inches. Using the Empirical Rule, what is the approximate percentage of head breadths that are between 2.2 and 3.4 inches? Do not enter the percent symbol. ans = %