Question 1205574
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Suppose there are 100 students.
40 girls and 60 boys.

Sum of scores of the 40 girls is 40*82.3=32920
Sum of scores of the 60 boys is 60*72.5=43500

Sum of scores of all 100 students = 3292+4350=7642

Average of all 100 students = 7642/100 = 76.42

Edwin</pre>