Discus results

This task is about reading information from a graph.
At the school athletics day 50 students entered a discus throwing competition. The graph shows the length of their throws.
graph of the distance of discus throws

Question 1Change answer

a)  How many students threw the discus
i)  less than 20 metres?
ii)  from 30 to 39 metres?

Question 1Change answer

b) What percentage of students threw the discus
i)  40 metres or more?  %
ii)  from 20 to 29 metres?  %

Question 2Change answer

c)  Explain why you cannot tell from the graph the distance of the longest throw.

Question 3Change answer

d)  What are two problems with the way this histogram has been set up?
1. 
2.