The table shows the number of boys and the number of girls in each year group at Springfield Secondary School.

There are 500 boys and 500 girls in the school.

Year Group Number of boys Number of girls 7 100 100 8 150 50 9 100 100 10 50 150 11 100 100 Total 500 500

Azez took a stratified sample of 50 girls, by year group.

Work out the number of Year 8 girls in his sample.