Question

9. In a large discount stores Maintenance department has of the light bulbs at the same time. Past experience the lives of are normally distributed with a mean life of 1200 hours and burned hours. When should the lights be replaced so that Draw diagram for normal distribution define the tin wers. (po om 75% and circle one of the multiple choice partment has been instructed to replace all 200 hours and standard deviation of 100 that the lives of light bulbs ced so that no more than 7.5% burned out? the b a nal distribution define the time of but that A) 1344 B) 1126 C) 1056 D) 1180 10. The population of weights of men is normally distributed with a mean of 173 lb and a standard deviation of 30 lb. An elevator in the Dallas Men's Club is limited to 32 tion of 30 lb. An elevation occupants ha occupants, but it will be overloaded if the 32 occupants have a menn weight in excess of 186 lb. If 32 male occupants are the results of a random selection, find the probability that their mean will exceed 186 lb, causine the elevator to be overloaded. Draw diagram for normal distribution of sample means, define the desired probability and circle one of the multiple choice answers. (6 points) A) 0.3336 B) 0.0071 C) 0.0418 D) 0.2676