Practice Test
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On a stem-and-leaf plot, each data value is broken into a stem and a leaf, where the digit on the left is the stem and the digit on the right is the leaf.
r|cccc 6 & 8 7 & 2 & 6 8 & 0 & 0 & 0 & 8 9 & 0 & 2 & 4 & 6 10 & 0 Key: 8|0 means 80 percent
We want to make a stem-and-leaf plot of the given quiz scores.
| Quiz Scores (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 96 | 88 | 80 | 72 | ||||||
| 80 | 94 | 92 | 100 | ||||||
| 76 | 80 | 68 | 90 | ||||||
68,72,76,80,80,80,88,90,92,94,96,100 Remember that on a stem-and-leaf plot, each data value is broken into a stem and a leaf, where the digit on the left is the stem and the digit on the right is the leaf. Because our data values range from 68 to 10, we will use tens digits for the stems and the ones digits for the leaves. For numbers with one digit, the stem will be 0. 6 8, 7 2, 7 6, 8 0, 8 0, 8 0, 8 8, 9 0, 9 2, 9 4, 9 6, 10 0 We will write the stems to the left of the vertical line and the leaves for each stem to the right of the vertical line. Remember that if there is a repeated number, it will appear on the plot the number of times it is repeated. r|cccc 6 & 8 7 & 2 & 6 8 & 0 & 0 & 0 & 8 9 & 0 & 2 & 4 & 6 10 & 0 Key: 8| 0 means 80 percent This is the stem-leaf plot of the quiz scores.