Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 20 minutes. What proportion of 1040R tax forms will be completed in less than 60 minutes? Round your answer to at least four decimal places.© BrainMass Inc. brainmass.com October 2, 2020, 1:02 am ad1c9bdddf
Mean = 100 minutes
Standard Deviation = 20 minutes
X = 60 minutes
Z score = (X-Mean)/Standard deviation = ...
The solution shows how to calculate the probability using normal distribution.