David's average score in the last 9 tests is 80. What should be his score in his next test, so that his average score will be 82 ?
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Answer:
Total score =80x9=720
Total in 10 tests: 82x10=820
In 10 the test he should take
820-720 = 100
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His score in the next test should be 100.
- David's average score in 9 tests is 80
- We have to find out the next score of Davis so that his average is 82
- Sum of all 9 test scores / 9 = 80
- Sum of all 9 test score = 720
- Average of all 10 test scores = Sum of all 10 test scores / 10
- we want average to be 82, so
82 = (Sum of all 9 test score + test score of 10th test) / 10
820 = 720 + test score of 10th test
test score of 10th test = 100
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