The lifetimes of a certain brand of photographic light are n…
The lifetimes of a certain brand of photographic light are normally distributed with a mean of 210 hours and a standard deviation of 50 hours. a) What is the probability that a particular light will last more than 250 hours? (2 marks) b) What percent of lights will need to be replaced within 235 hours? (2 marks) c) Out of 2000 lights, how many will have a lifetime between 200 and 350 hours. (2 marks)
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