Question 1201050
the mean is 65
the standard deviation is 10
the class size is 45.
you would need to know what percent of the class fall into each category.
assuming the distribution is normal, and assuming that 2% of the class are assumed to get an A, then you would look for what score is required to be in the top 2% of the class, grade wise.
using the normal distribution calculator at <a href = "https://davidmlane.com/hyperstat/z_table.html" target = "_blank">https://davidmlane.com/hyperstat/z_table.html</a>, it looks like the grade that would be required to get an A in this class would be a score greater than 85.
here are the results from using that calculator.


<img src = "http://theo.x10hosting.com/2023/031809.jpg">