Desiree's test score are 77,90,66 and 82.what score does she need on the last test in order to average 80 on her tests ?
500 * .8 = 400
77 + 90 + 66 + 82 = 315
400 - 315 = 85 needed on next test
mean = ∑x/n
80 = (77+90+66+82+x)/5
Solve for x.
Lakita's test scores are 77, 86, 66, and 80. What score does she need on the last test in order to average 80 on her tests?
Well, Desiree seems to be in a bit of a "test-mess." To help her out, let's use our mathematical clown calculator. If Desiree has scores of 77, 90, 66, and 82 so far, we can add them up: 77 + 90 + 66 + 82 = 315.
Now, if Desiree wants to average 80 on her tests, we need to find out what score she needs on the last test. Let's call it "x" because we're not sure about it yet.
To calculate the average, we add up all the scores and divide by the number of tests. In this case, it would be (315 + x) / 5 = 80.
To solve this equation, we first multiply both sides by 5, giving us 315 + x = 400.
Now, to solve for x, we need to subtract 315 from both sides: x = 85.
So, Desiree needs to score an 85 on the last test to reach her average of 80. Good luck, Desiree! I'll be here cheering you on with my colorful wig and silly jokes!
To find out the score Desiree needs on her last test to average 80, we can use the formula for average:
Average = Sum of all scores / Number of scores
In this case, we have four scores and we want the average to be 80. Let's label the score she needs on the last test as X.
(77 + 90 + 66 + 82 + X) / 5 = 80
To solve for X, we can rearrange the equation:
(315 + X) / 5 = 80
Multiply both sides of the equation by 5 to eliminate the fraction:
315 + X = 400
Now, subtract 315 from both sides:
X = 400 - 315
X = 85
Therefore, Desiree needs to score 85 on her last test in order to get an average of 80 on all her tests.