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Help with statistics homework

Statistics
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Bob Nale is the owner of Name's Quick Fill. Bob would like to estimate the mean number of gallons sold follows the normal distribution with a population standard deviation of 2.50 gallons. From his record he selects a random sample of 45 sales and finds the mean number of gallons sold at 8.30

a) What is the point estimate of the population mean? (Round your answer to 2 decimal places)

Point estimate

b) Determine a 95% confidence interval for the population mean ( Round your answer to 2 decimal pla.

Apr 8th, 2015

a) 8.30 gallons 

b)  std = 2.5/sqrt(45) = 0.373

95% Ci is     -1.96<(x-8.3)/0.373<1.96

8.30-0.731<x< 8.3+0.731

7.569<x<9.031

Apr 8th, 2015

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