The type of back-to-back comparative bar chart shown here is very popular, and is often used instead of the compound or multiple bar chart.

Population of working age: by gender and social class, Spring 1999

The very top bar on the left shows that, of all males of working age, about 8% of them were of professional class in 1999.

Q1. For which social classes was the proportion of the working population roughly the same for males and females?