Answer:
I mean I can give you some of my advice on 7 but I'm not too great on the others, but I hope this will help:
Step-by-step explanation:
Okay so on 7 you first need to figure out the amount of people in each grade and then you need to look at the premade answers and try to split it up AND on the total part you need to put how many people all together. If I'm not mistaken, I'm pretty sure there are more right-handed people, then left-handed people on 7th graders.
