Question

The final exam of a particular class makes up 40% of the final grade, and Moe is failing the class with an average (arithmetic mean) of 45% just before taking the final exam. What grade does Moe need on his final exam in order to receive the passing grade average of 60% for the class?

Answer 1

%82.5

Explanation:

1. The final exam of a particular class makes up 40% of the final grade
2. Moe is failing the class with an average (arithmetic mean) of 45% just before taking the final exam.

From point 1 we know that Moe´s grade just before taking the final exam represents 60% of the final grade. Then, using the information in the point 2 we can compute Moe´s final grade as follows:

`FG=0.40*FE+0.60*0.45`,

where FG is Moe´s Final Grade and FE is Moe´s final exam grade. Then,

`( FG-0.60*0.45)/(0.40)=FE`.

So, in order to receive the passing grade average of 60% for the class Moe needs to obtain in his exam:

`FE=( 0.60-0.60*0.45)/(0.40)=0.825`

That is, he need al least %82.5 to obtain a passing grade.