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CNNBC recently reported that the mean annual cost of auto insurance is 978 dollars. Assume the...

CNNBC recently reported that the mean annual cost of auto insurance is 978 dollars. Assume the standard deviation is 146 dollars. You will use a simple random sample of 64 auto insurance policies.

Find the probability that a single randomly selected policy has a mean value between 970.7 and 1009 dollars.
P(970.7 < X < 1009) =

Find the probability that a random sample of size n=64n=64 has a mean value between 970.7 and 1009 dollars.
P(970.7 < ¯xx¯ < 1009) =

Math   Statistics-And-Probability   
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