Question 1155920
using my TI-84 Plus calculator, i get p(x >= 30) equal to .0023974099.
using the online calculator at <a href = "http://davidmlane.com/hyperstat/z_table.html" target = "_blank">http://davidmlane.com/hyperstat/z_table.html</a>, i get .0024.
this is the same answer rounded to 4 decimal digits.
results from the online calculator are shown below:
<img src = "http://theo.x10hosting.com/2020/041303.jpg" alt="$$$" >