Find Anatomy Test Grade
User
Juanita's final grade in her college Anatomy class is determined solely by the mean of her four
test grades. She has already taken three of the tests and scored 85, 76, and 72. She is hoping to be
able to make an 80 average. Which of these could she solve to determine what grade she would need
to make on the last test?
233+X
= 80
3
233+x
= 80
4
A.
B.
4
c. 233+x=80
D. None of thes
The equation that could be solved to determine what grade Juanita would need to make on the last test is:
B. (233 + X) / 4 = 80
Here's why:
Juanita's final grade is determined solely by the mean of her four test grades. Therefore, the equation to find her final grade average is:
(85 + 76 + 72 + X) / 4 = final grade average
She is hoping to achieve an 80 average, so we can substitute 80 for the "final grade average" in the equation above:
(85 + 76 + 72 + X) / 4 = 80
To solve for X, we can multiply both sides by 4 to get rid of the fraction:
85 + 76 + 72 + X = 320
Now we can simplify by adding up the numbers:
233 + X = 320
Finally, we can solve for X by subtracting 233 from both sides:
X = 87
So Juanita would need to score an 87 on her last test to achieve an 80 average for the class. The equation that represents this is:
(233 + 87) / 4 = 80