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Problem 7 The amount of time spent by workers of a company to perform a certain task is a normally distributed random variable with a

Problem 7

The amount of time spent by workers of a company to perform a certain task is a normally distributed random variable with a mean of 7.5 hours and a standard deviation of 2.1 hours.

(b) (3 marks) Find the probability that a worker needs between 7 and 9 hours to perform the task.

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