Posted by **BV** on Friday, April 22, 2011 at 6:34pm.

In a city, 20% of the workers have incomes over $40,000 per year. A researcher chooses 1600 workers at random (with replacement) and finds that the mean is 320 and standard deviation is 16. what is the chance that between 320 and 336 of those have incomes over $40,000 per year?

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