# Calculating a weighted mean?

#### jridgeman99

##### New member
Hello, yes. I have a question pertaining to probability and statistics and it concerns finding a weighted mean which is shown through calculating a GPA. In this context it pertains to a review I'm doing and I cant figure out how I'm getting it wrong. I may be missing something rather little but I don't know. The problem consists of the following information saying the common system for determining a GPA assigns 4 points to an A, 3 points to a B,2 points to a C,1 point to a D, and 0 points to an F. Furthermore, what is the GPA of a student who gets an A in a 2 credit course, a B in each of three 3 credit courses, a C in a 3 credit course, and a D in a 4 credit course? For my answer I get that the computed GPA is 2.7 however the actual answer is 2.5 but I cannot figure out how.

#### Greg

##### Perseverance
Staff member
Hello jridgeman99 and welcome to MHB.

#### jridgeman99

##### New member
Yes, my work is as follows:

The weighted mean formula would be

4*2 + 3*3 + 2*3 + 1*4/ 4+3+2+1

#### Greg

##### Perseverance
Staff member
Other than a lack of appropriate parentheses I don't see anything wrong with your work. It's entirely possible that the given answer is in error.