SOLUTION: In a physics class the ratio of girls to boys is 1:3.The girls average score in a test was 70%, while the boys average score was 62%.Find the average of all the students in the cla

Question 1032540: In a physics class the ratio of girls to boys is 1:3.The girls average score in a test was 70%, while the boys average score was 62%.Find the average of all the students in the class.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
If the ratio of girls to boys in the class is 1:3, then 1/4, or 25% of the class is girls and 3/4, or 75% of the class is boys.
==> the average of all the students in the class is 0.25*70% + 0.75*62% = 64%.
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