Question 1169469
here's an approximate graph you can use.


<img src = "http://theo.x10hosting.com/2020/111003.jpg">


the approximate percentage is 34.13 + 34.13 + 13.59 = 85.85%.


i used a normal distribution calculator to confirm this is reasonable.


the calculator says 81.86%.


that's pretty close, so the approximate answer is reasonable.