Posted by **Ry** on Thursday, October 17, 2013 at 8:58pm.

In Wilbur's math class, his grade is based on the average score of six tests, each worth 100 points. Wilbur always worries about his grade. He knows that his average on the first four tests is 88.5. What is the lowest average he could get on his next two tests and still average 90 overall?

- Pre Algebra -
**Anonymous**, Thursday, October 17, 2013 at 9:01pm
If you think about the 6 tests as one big test, there are 600 marks overall. Wilbur got 88.5 * 4 = 354 out of the first 400 marks.

Now, to get 90 overall, you need 0.9*600 = 540 out of 600 marks. Now, 540-354 = 186, so that he must get 186 out of the next 200 marks. This translates to an mean of 186/2 = 93 for each of the last 2 tests.

## Answer this Question

## Related Questions

- Math - In Wilbur's math class, his grade is based on the average score of six ...
- Statistics - In your biology class, your final grade is based on several things...
- math - In your biology class, your final grade is based on several things: a lab...
- Statistics - In your biology class, your final grade is based on several things...
- Algebra - In his mathematics class, John has taken 3 tests, each worth 20% of ...
- math - At Smart Middle School students are required to take 7 classes each ...
- 8th grade - At Smart Middle School students are required to take 7 classes each ...
- Math - At Smart Middle School students are required to take 7 classes each ...
- Math 208 - Grade Average A student scores 65 and 82 on two different 100-point ...
- working with data - josephs final averages in science class are shown in the ...

More Related Questions