The raw data below represents the rate per hour of a sample of doctors in Paris. This data needs to be represented in a frequency distribution.

36, 41, 45, 52, 55, 58, 62, 66, 69, 70, 71, 72, 74, 76, 78, 79, 81, 83, 86, 88, 92, 95, 98, 101, 104, 107, 110, 112, 115, 118, 121

1. What is the number of classes?

2. What is the class interval?

3. Construct a frequency distribution showing classes, class frequency & cumulative frequency.

4. Show your data using a graphical chart.