Question

4 quiz scores of 86 +91 +81 +86. what score would you need to average 85

Answer 1

If you are asking what score is needed on a 5th quiz to average 85:

x= 5th quiz score

(86 + 91 + 81 + 86 + x)/5= 85
add all in parentheses

(344 + x)/5= 85
multiply both sides by 5

344 + x= 425
subtract 344 from both sides

x= 81


ANSWER: An 81 is the minimum score needed on the 5th quiz to have an average of 85.

Hope this helps! :)

Answer 2

This question is based on the concept of average.Therefore, the fifth quiz score would she need to average 85 is 81.

Given:

4 quiz scores of 86 +91 +81 +86

We need to determined the value of fifth quiz score.

According to the question,

Let x be the fifth quiz score.

Now, calculating the average of all the score.

We get,

$\dfrac{86 +91 + 81 + 86 + x }{5} = 85\\\\\dfrac{344+x}{5} = 85$

Now, multiplying both sides by 5 and solve it further,

We get,

$344 + x= 425$

x = 81

Therefore, the fifth quiz score would she need to average 85 is 81.

For further details, prefer this link:

https://brainly.com/question/2627174