The repair time for air conditioning units is believed to have a normal distribution with a mean of 39 minutes and a standard deviation of 11 minutes. What is the probability that the repair time for an air conditioning unit will take less than 30 minutes?
Use the information above to calculate the Z score. Round your answer to the second decimal place:
Use the calculated Z score along with the Z table to find the probability that the repair time for an air conditioning unit will be less than 30 minutes. Write your answer to the 4th decimal place:
Use the probability value that you just found and decide whether or not it would be unusual to have a repair time that is less than 30 minutes. Explain reasoning behind answer