(a)[1]
The $20 < d \le 40$ class contains $12$ workers. Complete the histogram.
(b)[3]
Calculate the percentage of workers who travelled more than $20\text{ km}$ to get to work.
Mathematics 4024 · O Level · Statistical charts and diagrams
Statistical charts and diagrams — practice question
A set of office employees is each asked to note the distance, $d$ kilometres, that they travel to work. The histogram shows the results for some of their journeys. There were $20$ workers in the $0 < d \le 5$ group.