The long-distance calls made by the employees of a company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. Find the probability that a call Lasts between 5 and 10 minutes. Lasts more than 7 minutes. Lasts less than 4 minutes. I already get marking scheme for part a. I have no idea why suddenly 0.9535-0.2276 popped up after the step P(0.5909
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