In order for Michael to get a B in his trigonometry class, he needs to...
MATHEMATICS
SAT 2021
In order for Michael to get a B in his trigonometry class, he needs to have an average of 80 on all his tests. He has one test remaining. His scores on his previous tests are 65,90,78,67. What score does Michael need on his last test to get a B?
- A. 98
- B. 99
- C. 95
- D. 100
Correct Answer: D. 100
Explanation
Recall how to find the average of a set of numbers: Mean/Average=Sum of all valuesNumber of values Now, let x be the score Michael needs on his last test in order to have a test average of 80. 80=(65+90+78+67+x)/5 Now, solve for x. 300+x=400 x=100
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