Please note that this question consists of three parts. You…
Please note that this question consists of three parts. You may use MINITAB to find a final answer. However you MUST show all the mathematical work to get to the final answer. Just giving the answer without adequate work/explanation may result in zero for the question. A local manufacturing company produces light bulbs. The lifespan of their light bulbs is normally distributed with mean 1160 hours and standard deviation 105 hours. What is the probability that the lifespan of a randomly selected light bulb manufactured by the company will be over 1200 hours? What value divides the longest 1% lifespans from the rest 99% of lifespans? A quality control team randomly selects a sample of 40 light bulbs and measures their lifespans. What is the probability that the average lifespan of 40 light bulbs will be over 1200 hours?