Grade average - insufficient

Classes are compared by achievement. In classes 3.A and 3.B the following grades were achieved in the subject of statistics.

gradenumber of grades 3.A number of grades 3.B
excellent 4 6
very good 10 11
good 12 9
satisfactory 5 4
insufficient 24


Which class achieved a better average?

Final Answer:

3A =  2.7273
3B =  2.6765

Step-by-step explanation:

3A=(4 1+10 2+12 3+5 4+2 5)/(4+10+12+5+2)=2.7273
3B=(6 1+11 2+9 3+4 4+4 5)/(6+11+9+4+4)=2.6765



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