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Mean annual cost of auto insurance

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Reference no: EM131870849

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.

Reference no: EM131870849

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