I have to make corrections to the questions which are not marked 5/5. I also have to explain what I did wrong for each question.

5. The mean undergraduate cost for tuition, fees, room and board for a four-year institution was $26,482 for a recent academic year and a standard deviation of $3204. Suppose that 36 four-year institutions are chosen. Find the probability that the mean cost for these 36 schools is: 3 a.) Less than $20,000 min may a P (x 24,000) = normalelf ($26,00, 00, 26489, 3204) = 0.99 9 *= (24,000 ,00 ) vijw c.) Find the 90th percentile for average undergraduate cost at a four-year institution. prob M a- 190 = Inversenovmal ( 0. 90, 26489, 3204) = 3 0595. 09