Question

PLS HELP! ASAP! PLS

The mean score of Brandons’s tests is 87. He took 7 tests with six scores of 87, 85, 84, 89, 91, and 87.


(A) Write an equation that can be used to determine Brandon’s 7th score.


(B) What was his score on the 7th test? Show your work

Answer 1

`(A): (87+85+84+89+91+87+x)/(7)=87\\ \\(B): x=86`

Explanation:

(A) We can find the mean of a set of values by dividing the sum of all the points by the total number of points.

(B) If we let x represent Brandon's score on his 7th test, we can solve for x using the equation for (A):

`(87+85+84+89+91+87+x)/(7)=87\\ (523+x)/(7)=87\\ 523+x=609\\x=86`