Private nonprofit four-year colleges charge, on average, $26,656 per year in tuition and fees. The standard deviation is $7,079. Assume the distribution is normal. Let X be the cost for a randomly selected college. Round all answers to 4 decimal places where possible. b. Find the probability that a randomly selected Private nonprofit four-year college will cost less than 23,912 per year. c. Find the 74th percentile for this distribution. $ (Round to the nearest dollar.)