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### Course: AP®︎/College Statistics>Unit 2

Lesson 2: Representing a quantitative variable with histograms and stem plots

# Reading stem and leaf plots

## Problem

A statistician for a chain of department stores created the following stem-and-leaf plot showing the number of pairs of glasses at each of the stores:
$|\phantom{\rule{1em}{0ex}}\begin{array}{c}0\phantom{0}\\ 1\phantom{0}\\ 2\phantom{0}\\ 3\phantom{0}\\ 4\phantom{0}\end{array}\phantom{\rule{1em}{0ex}}|\phantom{\rule{1em}{0ex}}\begin{array}{cc}9& \phantom{0}\\ 3& 6& 6& 8& \phantom{0}\\ 1& 2& 3& 5& 6& 9& \phantom{0}\\ 0& \phantom{0}\\ 1& 2& 3& 3& 5& 7& \phantom{0}\end{array}$
Key: $4\phantom{\rule{0.167em}{0ex}}|\phantom{\rule{0.167em}{0ex}}1=41$ pairs of glasses
How many department stores have fewer than $38$ pairs of glasses?
department stores