6.60 Cloning butterflies The wingspans of recently cloned monarch butterflies follow a normal distribution with mean 9 inches and standard deviation 0.75 inches. What proportion of the butterflies has a wingspan a. less than 8 inches? b. wider than 10 inches? c. between 8 and 10 inches? d. Ten percent of the butterflies have a wingspan wider than how many inches? What two numbers define the middle 40% of butterflies