/3] 5. The monthly utility bill of an apartment is approximately normal with a mean of $231.45 with a standard deviation of $25.80. a. Find the proportion of bills that are between $200 and $250. Show what was entered into the calculator. I b. Find the percentage of bills that are over $275. /3] 6. The heights of kindergarten children is approximately normal with a mean of 39 inches and a standard deviation of 2.3 inches. a. Find the percentage of students that are between 35 and 40 inches tall. b. Find the percentage of students that are less than 35 inches tall