# math

posted by .

If you earn the grades of 81, 84, 78, 80 in four tests what should your final test’s score be in order to have an average of 81%?

.81x400=324
Need a total of 324 pts
Test grades so far 81,84,78,80 = 323
324-323=1
You need at least one more point in order to have an average of 81%

is this correct?

• math -

Assuming the final test has the same weight as the other four, then total points you need will be 500*0.81=405.
How many points do you need in the final test if the cumulative total is 323?

• math -

82 %

## Similar Questions

1. ### math correction

can someone correct this for me.or teach me if i'm wrong Statistics. Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75,63, and 68. Write an inequality representing …
2. ### math,correction

can someone correct this for me please. Statistics. Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75,63, and 68. Write an inequality representing the score that …
3. ### math

If you earn the grades of 81, 84, 78, 80 in four tests what should your final test’s score be in order to have an average of 81%?
4. ### math

Paul has grades of 73 and 86 on his first two tests. What must he score on his third test in order to have an average of at least 70?
5. ### math

On three tests you earned grades of 88%,94% and 90%. Each test was worth 150 points. The final exam is worth 250 pts. How many pts do you need on the final exam to earn 93% of the total points on tests?
6. ### Algebra 1

In order to earn an A in a class, your test scores must average at least 92%. On the first 6 tests, you have an average of 91%. What score do you need to get on the last test to earn an A?
7. ### math

a final examination score in General maths is weighted four times as much as each test score If the student has a final exam score of 87% and test grades of 70% and 92%, then the mean score is