Stem-and-Leaf Plots: Homework

Split each number into a stem and a leaf, keep the empty stems, and read the plot.

Doing it on screen?Tap or click a box and type your answer. When you’re done, press Check My Answers at the bottom of the sheet.

Part A — Stems and Leaves / 5

The tens digit is the stem and the ones digit is the leaf. A single-digit number has a stem of 0.

Use the plot to answer. The key is 6 | 4 means 64.

Each problem has a mistake in it.

1.
A student builds the 20s row for 23, 27, 23 and 29 as 2 | 3 7 9. How many leaves should it have?Answer
2.
The data is 5, 14, 17, 41 and 44. A student writes stems 0, 1 and 4 only. Which stems did he leave off?Answer
3.
A student leaves the key off a plot. What could go wrong?Answer
4.
A student leaves the leaves in the order they came from the list. Is the plot still correct? What should he do?Answer

The noble gases and the halogens are two families on the periodic table. These are their atomic numbers, and they are real.

Write your answer in a sentence or two.

1.
Write ten two-digit numbers whose plot has an empty stem in the middle. Say which stem is empty.Answer
2.
When is a stem-and-leaf plot a better choice than a line plot?Answer

Done? Check your answers.

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Total / 22

Graded by

Notes

Part A — the answers.

Part B — the answers.

Part C — the answers.

4. The repeated 23 needs its own leaf.
2 and 3. Empty stems stay on the plot.
Answers vary. The reader can't tell whether 3 | 8 means 38, 3.8 or 308.
Answers vary. The leaves should be rewritten in order from least to greatest, or reading the median and the mode gets much harder.

Part D — the answers.

a. 9 b. 4 (the 20s, 40s, 60s and 70s) c. 3. d. 11 e. 35, the 6th of the 11 values. f. No mode. Every value appears once.

Part E — one correct answer, and what a good explanation says.

Answers vary. One that works is 12, 15, 18, 21, 24, 52, 55, 58, 59, 63: the 3 and 4 stems are empty.
Answers vary. A stem-and-leaf plot is better for many different two-digit values, since a line plot would need a long number line with mostly one X at each spot, and the stems group the numbers while keeping every value.