Answer: 385
Step-by-step explanation:
Mean the three groups of 10 kids=35
Total weight of 3 groups (10x35)=350
Mean weight of 3 groups and one boy ( 35 + 350)=385
..........................
68.8% is your answer
when changing a decimal to a percentage, move the decimal point twice over
hope this helps
4 times 7 gets 28 and 7-4 gets you 3
