Private nonprofit four-year colleges charge, on average, $26,428 per year in tuition and fees. The standard deviation is $6,686. Assume the distribution is normal. Let X be the cost for a randomly selected college. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X ~ N( , ) b. Find the probability that a randomly selected Private nonprofit four-year college will cost less than 23,550 per year. c. Find the 61th percentile for this distribution. $ (Round to the nearest dollar.)