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The number of students that took Mrs. Smith's Math test as dshown in the stem-and-leaf plot is: 20.
A stem-and-leaf plot displays a data distrubution as follows, i.e., if 56, 57 are data points, 5 would be the stem while 6, 7 will be the leaf (5 | 6, 7).
The data points in the stem-and-leaf plot shown represents the score of each of the student. There are 20 data points.
Therefore, the number of students that took the test is: 20.
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