Question 1199365
not sure how you did it, but these are the results i got using excel to perform the calculations.


<img src = "http://theo.x10hosting.com/2022/122703.jpg">
<img src = "http://theo.x10hosting.com/2022/122704.jpg">


the probability of between 22 and 28 is simply the sum of p(22) through p(28).
you should get 0.628878118 as shown in the excel file.


your other proabilities are good.
let me know if this works for you.
theo