Question

A teacher figures out her students’ final grade in the class by finding the mean of the following three
scores: the midterm, the final exam, and the student’s average on quizzes. Jenny’s average on the
quizzes is a 90. But she scored a 70 on the midterm. What would Jenny have to score on the final exam
to pass the class with an average of 85?

Answer 1

Answer:

95%

Step-by-step explanation:

To find the average, we add up all the scores and divide by 3.

We know 2 of the scores, but one is unknown, we will call it x.

$\frac{x+90+70}{3}$

Jenny wants the average to be 85, so we can set the expression equal to 85

$\frac{x+90+70}{3}$=85

Multiply by 3 on both sides

160+x=255

Subtract 160 from both sides

x=95

She will have to score a 95 to pass the class with an 85 average  

Hope this helps!

Answer 2

Answer:

She would have to score a 75 or more

Step-by-step explanation: