#### Answer

A professor claims that his grades are distributed as follows:
Stated Grade Distribution:
A=7% B=24% C=38% D=24% F=7%
A colleague collects data on the 340 students that the professor taught this year and finds:
Actual Grades this Year
A=20 B=74 C=120 D=88 F=38

#### Work Step by Step

This is a goodness of fit chi square problem. We are given a hypothetical model of the data distribution, and we are to determine if our actual data values fit intro this model.