I've attached the graphs to this answer. I hope they help.
There might be a variety of averages for the 12 boys.
Answer:
9178.5
Step-by-step explanation:
Follow PemDas
From Left to Right, you multiply 87 x 422, which is 36,714
Then, thake that number and divide it by 4, giving you 9,178.5
You should ask your parent/guardian
or teacher if needed! Merry Christmas!