12. A recent article in the Cincinnati Enquirer reported shat tis mean labor cost to re- pair a heat pump is $90 with a standard deviation of $22 lonte's Plumbing and Heating Service completed repairs on two heat pumps this niorning. The labor cost for the first was $75 and it was $100 for the second. Assume the distribution of la- bor costs follows the normal probability distribution. Compute z values for each and comment on your findings