## 123F 4 years ago Based on the histogram, how many students were included in the survey? What percentage of the students surveyed babysat for at most three hours last weekend? Show your work.

1. 123F

2. 123F

HELP plz

3. mathteacher1729

Firstly, do you know how to read this kind of graph? In other words, how many students babysat for 0 to 3 hours? How many for 4-7 hours?

4. 123F

25?

5. mathteacher1729

I meant individually... 0-3 hrs = how many? 4-7 hrs = how many? etc.

6. 123F

0-3 hrs = 20 4-7 hrs = 5 8-11 hrs = 30 12-15 hrs = 25

7. mathteacher1729

Correct! Ok, now the next step is this: how many students were included in the survey? Well, that's easy -- just add them all up. :)

8. 123F

20+5+30+35=90?

9. 123F

thank you

10. 123F
11. mathteacher1729

You're welcome. But that's the first part of the problem. There is still one part remaining! >What percentage of the students surveyed babysat for at most three hours last weekend? That, too, should be easy. "babysat for AT MOST" three hours means only those who did 0 to 3 hrs. So take that number (the 0-3 hours) and divide it by 90 , the multiply by 100. That's your percent. :)

12. mathteacher1729

Oh my, what a sad song. :( Here is a happy song: http://www.youtube.com/watch?v=Ds2RrLNPAHc