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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.

(d) (4 marks) What is the amount of time below which 5% of all the workers perform the task?

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