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*I ALREADY GOT THE ANSWER JUST WANT TO MAKE SURE IM CORRECT THANKS*

devonte's scores on his first four spanish tests are 92,85,90,and 92. what test score must devonte earn on the fifth test so that the mean will be exactly 90?

*i think the answer is 91*

Respuesta :

zexius
So to get the mean, you need to work out the sum of the values and divide it by the number of values there are.

This means you should do:

(Let x represent the fifth score)

(92 + 85 + 90 + 92 + x) / 5 = 90
(92 + 85 + 90 + 92 + x) = 450
359 + x = 450
x = 450 - 359
x = 91

So the answer is 91 and you are correct :)
AnimeBrainly

Note that the fifth test = x

There are 5 tests, and the mean will be 90

" (92 + 85 + 90 + 92 + x)/5 = 90 " is your equation

Simplify

(359 + x)/5 = 90

Isolate the x. Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS.

(359 + x)/5 (5) = 90(5)

359 + x = 450

Isolate the x. subtract 359 from both sides

x + 359 (-359) = 450 (-359)

x = 450 - 359

x = 91

Answer: 91

hope this helps

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