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There are 30 students in a year 10 maths class. In the latest test the 21 girls in the class score a mean of 61%. In the same test the 9 boys in the class scored a mean of 78%. …

There are 30 students in a year 10 maths class. In the latest test the 21 girls in the class score a mean of 61%. In the same test the 9 boys in the class scored a mean of 78%. …
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There are 30 students in a year 10 maths class. In the latest test the 21 girls in the class score a mean of 61%. In the same test the 9 boys in the class scored a mean of 78%. Calculate the mean for the whole group of students.

User GAMELASTER
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Total score of the 21 girls = 61*21 = 1281
Total score of 9 boys = 78*9 = 702

Mean for all 30 students = (1281+702) / 30 = 1983 / 30 = 66.1 % (answer)
User SGR
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