Question: The survey results state that the average full-time worker is 43.4 hours a week and follows a normal distribution. To calculate the standard deviation of

The survey results state that the average full-time worker is 43.4 hours a week and follows a normal distribution. To calculate the standard deviation of the population, a sample of 40 full-time workers was taken and 12% of them worked more than 48 hours a week. What is the population standard deviation?

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