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CNNBC recently reported that the mean annual cost of auto insurance is 991 dollars. Assume the...

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.

Math   Statistics-And-Probability   
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