The stem-and-leaf plot represents the distances, in miles, people in an office drive to work each morning. How many people drive 20 miles or fewer to work?

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A stem-and-leaf plot with a stem value of 1 with a leaf value of 5, 5, 6, 6, 7, 7, 8, 8, a stem value of 2 with a leaf value of 1, 4, 5, 9, and a stem value of 3 with a leaf value of 0, 5, 5, 6.

Key: 1|5 means 15