between 1971-1975, the cdc sampled white blood cells from 1,241 people aged 25-34, and found the average number of blood cells per microliter to be 4.5 with a standard deviation of 1.63 blood cells. (https://www.cdc.gov/nchs/data/series/sr 11/sr11 220.pdf) assume that white blood cell count is normally distributed. a. if one person aged from 25-34 is randomly selected, what is the probability that their white blood count is between 3.2 and 5 per microliter? include the commands you input into your calculator. (3 pts) b. how many white blood cells per microliter would a 25-34 year old who is in the 15th percentile have? include the commands you input into your calculator. (2 pts)