Pocket money II

This task is about reading information from a histogram.

Connor did a survey of 9-year-olds and 11-year-olds to find out how much pocket money they were given each week. He spoke to 50 children of each age group. When the tally was completed the results looked like this:

graph of pocket money for year 9 and year 11 students


a)

i)

What is the most frequent amount of pocket money for 11-year-olds? $__________
   
ii)
 
How does that compare with the 9-year-olds most frequent amount?

 

 
 
 
b)
 
i)
 
What percentage of 9-year-olds got $2 or less? __________%
   
ii)
 
What percentage of 9-year-olds got more than $10? __________%
 
c)
 
How does the percentage of 9-year-olds compare with the percentage of 11-year-olds who got more than $10?

 

 
 
 
 
d)
What is one problem with the way this histogram has been set up?