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.

Question

anonymous · Answer

attachment

anonymous · Answer

HELP plz

mathteacher1729 · Answer

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?

anonymous · Answer

25?

mathteacher1729 · Answer

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

anonymous · Answer

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

mathteacher1729 · Answer

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. :)

anonymous · Answer

20+5+30+35=90?

anonymous · Answer

thank you

anonymous · Answer

http://www.youtube.com/watch?v=BbSmCrvlyrA

mathteacher1729 · Answer

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. :)

mathteacher1729 · Answer

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