Statistics & Probability Problem 6
Test Averages

Your mathematics teacher, Mr. Spinger, says you have an 86.5% test average after 8 tests. You will be taking 4 more tests and you hope to raise your overall test average to 90%.

What do you have to average on the next four tests in order to have a 90%?

What do you have to average on the next four tests in order to have a 90% or better average? Explain your thinking throughout and your answer(s).


Math Scoring Guide
Download the Oregon Math Scoring Rubric 

Name: ________________________ Period: ____
Teacher: ______________________

Date: ___/____/___

CU - Conceptual Understanding 1 2 3 4 5 6

Comments:

PS - Processes & Strategies 1 2 3 4 5 6

Comments:

V - Verification 1 2 3 4 5 6

Comments:

C - Communication 1 2 3 4 5 6

Comments:

ACC - Accuracy 1     4 5  

Comments:

___ May be revised and returned for an improved score.