Find the total points for each group:
31 students averaged 82, so the total points were 31 x 82 = 2542
2 students averaged 88, so the total points were 2 x 88 = 176
Now add the total points and divide by 33 students (31 +2):
2542 + 176 = 2718
2718 / 33 = 82.36
The average is 82.36 ( Round as needed).
31 students averaged 82, sum was 31 x 82 = 2542
2 students had an average of 88, sum is 2 x 88 = 176
2542 + 176 = 2718 (total points)
2718 / 33 = 82.36--> average
The average is 82.36
