A recent article in the Cincinnati Enquirer reported that the mean labor cost to repair a heat pump is $90 with a standard deviation of $22. Monte's Plumbing and Heating Service completed repairs on two heat pumps this morning. The labor cost for the first was $75 and it was $100 for the second. Compute z values for each and comment on your findings.© BrainMass Inc. brainmass.com September 21, 2018, 2:14 am ad1c9bdddf - https://brainmass.com/statistics/normal-distribution/normal-distribution-mean-labor-cost-to-repair-a-heat-pump-49442
The first z-value is negative because the value of x = 75 is less than the mean ...
This solution provides the appropriate formulas and a step by step methodology, with the calculations formatted, in the attached Word document. An interpretation of the z-values is also given.