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 21% of your total grade, each major test is worth 25%, and the final exam is worth 29%. Compute the weighted average for the following scores: 60 on the lab, 81 on the first major test, 69 on the second major test, and 79 on the final exam. Enter your answer as a whole number.

Answer 1

`Weighted\ Average = 73`

Explanation:

Given

`Lab = 21\%`

`Tests = 25\%`

`Exam = 29\%`

`Lab\ Score = 60`

`First\ Test = 81`

`Second\ Test = 69`

`Exam = 79`

Required

The weighted average

To do this, we simply multiply each score by the corresponding worth.

i.e.

`Weighted\ Average = Lab\ worth * Lab\ score + Tests\ worth * Tests\ score.....`

So, we have:

`Weighted\ Average = 21\% * 60 + 25\% * 81 + 25\% * 69 + 29\% * 79`

Using a calculator, we have:

`Weighted\ Average = 73.01`

`Weighted\ Average = 73` --- approximated