Question 358361
Suppose that the time required to complete a 1040R tax form is normally 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 119 minutes: Round your answer to at least four decimal places. 
------------------------
z(119) = (119-90)/20 = 1.45
---
P(x>= 119) = P(z>= 1.45) = normalcdf(1.45,100,) = 0.0735
Proportion: 7.35/100

================
Cheers,
Stan H.