SOLUTION: How do I solve this problem? 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

Question 358361: How do I solve this problem?
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.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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.
RELATED QUESTIONS
Suppose that the time required to complete a 1040R tax form is normally distributed with... (answered by stanbon)

Suppose that the time required to complete a 1040R tax form is normally distributed with... (answered by stanbon)

Please help me solve this problem: In a driving school, the time taken by student... (answered by stanbon)

An employer wants to estimate to set a time limit so that 90% of the employees will... (answered by stanbon)

An employer wants to set a time limit so that 95% of the employees will finish a job on... (answered by stanbon)

The time required for a citizen to complete the 2000 U.S. Census �long� form is normally... (answered by edjones)

How do I solve the following problem based on the formula, Z = (x-m)/sd The graduate... (answered by stanbon)

Let x denote the time taken to run a road race. Suppose x is approximately normally... (answered by ewatrrr)