The life spans of a species of fruit fly have a bell-shaped distribution, with a mean of 33 days and a standard deviation of 5 days. (a) The life spans of three randomly selected fruit flies are 35 days, 32 days, and 47 days. Find the z-score that corresponds to each life span. Determine whether any of these life spans are unusual. (b) The life spans of three randomly selected fruit flies are 38 days, 23 days, and 48 days. Using the Empirical Rule, find the percentile that corresponds to each life span. (a) The z-score corresponding a life span of 35 days is (Type an integer or a decimal rounded to two decimal places as needed.)