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CNNBC recently reported that the mean annual cost of auto insurance is 1009 dollars. Assume the standard deviation is 159 dollars. You will use a simple random sample of 72 auto insurance policies.
Find the probability that a single randomly selected policy has a mean value between 960.3 and 1039 dollars.
P(960.3 < X < 1039) =
Find the probability that a random sample of size n = 72 has a mean value between 960.3 and 1039 dollars.
P(960.3 < ¯x< 1039) =
Enter your answers as numbers accurate to 4 decimal places.
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