NNBC recently reported that the mean annual cost of auto insurance is 1003 dollars. Assume the standard deviation is 112 dollars. You will use a simple random sample of 86 auto insurance policies.

Find the probability that a single randomly selected policy has a mean value between 1022.3 and 1025.9 dollars.

P(1022.3 <X< 1025.9) =

Find the probability that a random sample of sizen

=

86

n=86

has a mean value between 1022.3 and 1025.9 dollars.

P(1022.3 <

x

x

< 1025.9) =

Enter your answers as numbers accurate to 4 decimal places.

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