Pre Algebra

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?

1. ๐ 0
2. ๐ 0
3. ๐ 34
1. 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.

1. ๐ 0
2. ๐ 0
posted by Anonymous

Similar Questions

1. Math

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 four first tests is 88.5. What is the lowest average he

asked by Katherine on September 22, 2010
2. programming concepts

Mr. Jones always gives True/False tests to his class. His tests always have 20 ques- tions. The maximum class size is 35. He needs a program that will calculate the stu- dentsโ grades based on the best score. Grade A will range

asked by sam on May 15, 2015
3. programming concepts

Mr. Jones always gives True/False tests to his class. His tests always have 20 ques- tions. The maximum class size is 35. He needs a program that will calculate the stu- dentsโ grades based on the best score. Grade A will range

asked by sam on May 15, 2015
4. bridge

Mr. Feng conducted five math tests. Trinity had completed four tests and scored 79, 78, 82, and 75. She wanted to achieve an average of 80% in her math tests. Write an inequality to find the minimum score Trinity can make on the

asked by Summer on September 6, 2016
5. Math

In math class, a student has an average grade of 85% for five tests so far. What grade must that student earn on the next test to reach an average grade of 90% for all six tests?

asked by Sophia on December 1, 2016
6. working with data

josephs final averages in science class are shown in the table below. homework % toward final grade-20% average-93 quizzes % toward final grade-20% average-92 tests % toward final grade-40% average-85 final exam % toward final

asked by mike on February 24, 2008
7. Math

In yourโ class, you have scores of 73,85,76, and 92 on the first four of five tests. To get a grade of Upper C, the average of the first five tests scores must be greater than or equal to 70 and less than 80. a) Solve an

asked by Ms. E on October 1, 2015
8. Statistics

In your biology class, your final grade is based on several things: a lab score, score on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 25% of

asked by John on June 24, 2010
9. Math

Kami has an average of 64% in her class. School ends soon and she would like to raise her grade to a 74%.She has 2 tests left and tests counts as 80% of her grade, what would she have to get on the next to test to get her average

asked by Kammi on March 25, 2015
10. math

In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 16% of

asked by Ashley on June 3, 2012

More Similar Questions