Question

CNNBC recently reported that the mean annual cost of auto insurance is 991 dollars. Assume the standard deviation is 199 dollars. You will use a simple random sample of 83 auto insurance policies.

Find the probability that a single randomly selected policy has a mean value between 938.6 and 1047.8 dollars.
P(938.6 < X < 1047.8) =

Find the probability that a random sample of size n=83n=83 has a mean value between 938.6 and 1047.8 dollars.
P(938.6 < M < 1047.8) =

Enter your answers as numbers accurate to 4 decimal places.

Answer 1