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  3. suppose that the time required to complete a 1040r

Suppose that the time required to complete a 1040R tax form is normal distributed with...

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Suppose that the time required to complete a 1040R tax form is normal distributed with a mean of 90 minutes and a standard deviation of 20 minutes What proportion of 1040R tax forms will be completed in at least 120 minutes Round your answer to at least four decimal places

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