A population of values has a normal distribution with =215.7 and =36 a. Find the probability that a single randomly selected value is greater than 220.2 . Round your answer to four decimal places. P(X>220.2)= b. Find the probability that a randomly selected sample of size n=189 has a mean greater than 220.2. Round your answer to four decimal places. P(M>220.2)=.