The stem and leaf diagram shows the ages of people in a cinema. Key: 2 1 represents 21 years
2 1 3
3 0 2 2 5
4 3 4 6 8 9 9
5 0 2 2 3 5
a) What is the range of ages?
years
b) How many people are represented in the diagram?
people
c) What is the median age?
years old​