Question

What do you need to earn on the final exam, if you want at least an 80 in your English class, if your averages and values are the following? use system 1Test average= 75projects= 84homework= 95class participation= 85

Answer 1

You need to earn at least 61 on the final exam.

Explanation:

The average is given by the following relation:

A = S/n

In which S is the sum of all the other grades, and n is the number of tests.

In this exercise:

The sum of the grades is:

S = 75 + 84 + 95 + 85 + x, which x is the grade on the final exam. So

S = 339 + x

Five grades(average, projects, homework, class participation and final exam), so n = 5.

Grade of at least 80. So

A >= 8

S/n >= 80

(339 + x)/5 >= 80

339 + x >= 80*5

339 + x >= 400

x >= 400 - 339

x >= 61

You need to earn at least 61 on the final exam.