A population of values has a normal distribution with - M 195.8 and σ = 33.9. If a random sample of size n = 15 is selected, a. Find the probability that a single randomly selected value is less than 173.9. Round your answer to four decimals. P(X 173.9) = < b. Find the probability that a sample of size n = 15 is randomly selected with a mean less than 173.9. Round your answer to four decimals. P(M < 173.9) =

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