Compute the weighted average for the following scores

Question

In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 22% of your total grade, each major test is worth 24.5%, and the final exam is worth 29%. Compute the weighted average for the following scores: 64 on the lab, 78 on the first major test, 80 on the second major test, and 74 on the final exam. (Enter your answer to one decimal place.)

Answer 1

Hello,

 

For this you would first multiply each score by its weight. Then add those up and divide by the sum of the weights.

Mathematically, that would look like:

((22*64) + (24.5*78) + (24.5*80) + (29*74)) / (22 + 24.5 + 24.5 + 29)

We reduce to: 7425/100 which gives us 74.25% or 74.3% when rounded to one decimal.