Question

CNNBC recently reported that the mean annual cost of auto insurance is 1000 dollars. Assume the standard deviation is 229 dollars. You take a simple random sample of 100 auto insurance policies. Find the probability that a single randomly selected value is less than 989 dollars. P(X < 989) = Find the probability that a sample of size n = 100 n = 100 is randomly selected with a mean less than 989 dollars. P(M < 989) = Enter your answers as numbers accurate to 4 decimal places.

Answer 1