12. A popular flashlight that uses two D-size batteries wasselected and several

12. A popular flashlight that uses two D-size batteries wasselected and several of the same models were purchased to test thecontinuous-use life of D batteries. To determine thecontinuous-use life of two D-size batteries a fresh pairof D-sized batteries were installed in a flashlight the flashlightwas turned on and the time noted. When the flashlight no longerproduced light the time was again noted. The resulting life datafrom the batteries had a mean of 22.5 hours. Assume these valueshave a normal distribution with a standard deviation of 1.58hours.