Question 417713
Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 110 minutes and a standard deviation of 10 minutes. What proportion of 1040R tax forms will be completed in at most 104 minutes? Round your answer to at least four decimal places.
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z(104) = (104-110)/10 = -6/10 = -0.6
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P(x <= 104) = P(z <= -0.6) = normalcdf(-100,-0.6) = 0.2743
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Cheers,
Stan H.
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