Question

Your grades on three exams are 80, 93, and 91. What grade do you need on the next exam to have an average of 90 on the four exams?

Answer 1

Answer:  You would need a score of 96 on your last exam.

Step-by-step explanation:

If you take the 90 average and multiply it by 4, you get 360.  If you add your first 3 exam grades and subtract them from 360, then you get 96 as your final score.  To check your work, add the 4 exam scores and find the average.  The average is 90.

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Answer 2

Answer:

96

Step-by-step explanation:

The average of a set of data can be found by taking the sum of the values in the data divided by the number of values.

$\boxed{\text{Average of 4 exams}= \frac{\text{Total score of 4 exams}}{4}}}$

Let the score of the next exam be x.

$90=\frac{x+80+93+91}{4}$

Multiply both sides by 4:

360= x +264

Subtract both sides by 264:

x= 360 -264

x= 96

Thus, a grade of 96 is needed on the next exam.

Supplementary:

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