SOLUTION: Hi! Please help with the following question. Thanks! In a certain doctors’ office the waiting time is normally distributed with a mean of 25 minutes and a standard deviation o

Algebra ->  Probability-and-statistics -> SOLUTION: Hi! Please help with the following question. Thanks! In a certain doctors’ office the waiting time is normally distributed with a mean of 25 minutes and a standard deviation o      Log On


   

Question 1179205: Hi! Please help with the following question. Thanks!
In a certain doctors’ office the waiting time is normally distributed with a mean of 25 minutes and a standard deviation of 5.3 minutes. Laura just walked into the doctors’ office. Find the probability that she will have to wait longer than 18 minutes before seeing the doctor.
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
the waiting time follows normal distribution.
mean is 25 minutes.
standard deviation is 5.3 minutes.
probability she will have to wait long than 18 minutes before seeing the doctor is .9067 using the calculator at:
https://davidmlane.com/hyperstat/z_table.html
here are the results:



there are other ways to do it, but this is the easiest.

if you need to know more, just let me know.\