Question: Hi, please show your work so I understand and please write clearly. There is no need to rush -- thank you The life span of

Hi, please show your work so I understand and please write clearly. There is no need to rush -- thank you

The life span of LED light bulbs is normally distributed with a mean and a stande deviation equal to sac and l hours, respectively. The life span of uorescent light bulbs is normally distributed with a mean and a standard deviation equal to S and 8D hours. respectively. a} Suppose a sample of four uorescent light bulbs is selected. Find the probability that the mean life span of the uorescent light bulbs is less than I543 hours

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