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| Math Central | Quandaries & Queries |
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Question from edy, a student: 6 courses have an average of 100 in the first semester |
Hi Edy,
If the grades in 6 courses in the first semester had an average of 100 then this was calculated by
(sum of the scores on the 6 courses in the first semester)/6 = 100
Thus the sum of the scores on the 6 courses in the first semester was 6 × 100 = 600.
If the grades in 5 courses in the second semester had an average of 90 then what was the sum of the scores on the 5 courses in the first semester?
What was the sum of the grades in the 11 courses over both semesters? What is their average?
Penny
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