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CNNBC recently reported that the mean annual cost of auto insurance is 1008 dollars. Assume the...

CNNBC recently reported that the mean annual cost of auto insurance is 1008 dollars. Assume the standard deviation is 130 dollars. You will use a simple random sample of 110 auto insurance policies.

Find the probability that a single randomly selected policy has a mean value between 998.1 and 1041.5 dollars.
P(998.1 < X < 1041.5) =

Find the probability that a random sample of size n=110n=110 has a mean value between 998.1 and 1041.5 dollars.
P(998.1 < M < 1041.5) =

Math   Statistics-And-Probability   
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Answer #1

a) The probability that a single randomly selected policy has a mean value between 998.1 and 1041.5 dollars is

b) The probability that a random sample of size n=110 has a mean value between 998.1 and 1041.5 dollars is

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