Probability from stem and leaf plot
The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?
2 0 2 6 7 9
3 0 3 4 5 6 8 8 9 9
4 2 4 5 6 7
5 2 3 4 7
6 1 3