Mathematics

Mr. Wong is a history teacher. In order to study how his 6th period class did on a 100-point test, he made the stem-and-leaf plot shown. Twenty-five students took the test.

The figure shows the stem-and-leaf plot labeled as Student Scores on History Test. In the plot, 6th Period Class represents the leaf. For 0 as stem, there is no value of leaf. For 1 as stem, there is no value of leaf. For 2 as stem, leaf is 8. For 3 as stem, there is no value of leaf. For 4 as stem, there is no value of leaf. For 5 as stem, leaves are 2, 7, and 7. For 6 as stem, leaves are 0, 1, 8, and 9. For 7 as stem, leaves are 0, 2, 2, 3, 5, and 8. For 8 as stem, leaves are 1, 1, 5, 6, 7, and 9. For 9 as stem, leaves are 0, 2, 6, and 8. And for 10 as stem, leaf is 0. Below the plot, Key: for 7 as stem and 5 as leaf the value equals 75 points is labeled.

Which conclusion can Mr. Wong draw from this data display? Select two answers.
A.
There were no perfect scores on the test.

B.
One student’s score is an outlier.

C.
Most students scored above an 80.

D.
The same number of students scored 70-79 and 80-89.

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