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Problem 7. (14 points) The lifetime of a certain type of TV tube has a normal distribution with a mean of 61 and a standard

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Problem 7. (14 points) The lifetime of a certain type of TV tube has a normal distribution with a mean of 61 and a standard deviation of 4 months. What proportion of the tubes lasts between 54 and 57 months? Answer: % Note: Round your answer to 2 decimal places

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