73% . Wed 11:59 PM aE Chrome File Edit View History Bookmarks People Window Help

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73% . Wed 11:59 PM aE Chrome File Edit View History Bookmarks People Window Help Connect c Secure https://newconnect.mheducation.com/flow/connect.html × D z distribution table 0 Katy perry Humming e what Is The Correct Chrome File Edit × M McGraw-Hill Connec Check my work mode : This shows what is correct or incorrect for the work you have completed so far. It does not indicate completion. Return to question Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 1.90 gallons. From his records, he selects a random sample of 75 sales and finds the mean number of gallons sold is 5.40 points a. What is the point estimate of the population mean? (Round your answer to 2 decimal places.) Answer is complete and correct. 5.40 8 AM b. Develop a 99% confidence interval for the population mean, (Use Z Distribution Table.) (Round your answers to 2 decimal places.) 6 AM Answer is complete but not entirely correct. (5.18) and 5.62 0 AM Mc Graw Hill Prey.1 of 5 Next> 6

Explanation / Answer

we know that the CI is given as

Mean +- z*sd/sqrt(n)

here n = 75
sd = 1.9
z = 2.58 , from the z table for 99% CI

mean = 5.4
put the values in the above equation

5.4 +- 2.58*1.9/sqrt(75)

so solving for plus and minus sign

4.833 , 5.966

Hope this helps
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