QUESTION 5 A certain manufacturer makes energy efficient LED light bulbs. After many years of product testing, the company knows that the average lifetime of these light bulbs is bell-shaped with a mean of 60,000 hours and a standard deviation of 8,000 hours. a. What is the probability that a randomly selected light bulb has a lifetime between 56,000 and 62,000 hours? b. What is the probability that the lifetime of a randomly selected lightbulb is less than 58,000 hours? c. What percent of individual light bulbs last at least 50,000 hours? Answer as a percent to two decimal places. d. Determine the number of hours by which 80% of the bulbs will have stopped working. Round two decimal places