Unit 3 Review: Homework

Two problems from every skill in the unit, tagged by lesson, and one real table that uses several of them at once.

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Part A — Lessons 1 to 4 / 5

Each problem says which lesson it came from. Write the answer.

1.
(U3-L3) Find the range: 63, 18, 45, 90, 27Answer
2.
(U3-L3) A scale runs from 0 to 200 and counts by 25. How many marks does it have?Answer
3.
(U3-L4) In the data 14, 15, 15, 16, 15, 14, 52, which value is the outlier?Answer
4.
(U3-L4) A line plot has 3 Xs over 6, 5 Xs over 7 and 2 Xs over 8. How many values are in the data?Answer
5.
(U3-L3) A graph's data runs from 120 to 480. What is the range?Answer

The mean, the median, the mode, and stem-and-leaf plots.

1.
(U3-L5) Find the mean: 9, 14, 11, 6, 15Answer
2.
(U3-L5) Find the median: 22, 18, 30, 26, 25, 21Answer
3.
(U3-L5) Find the mode: 8, 3, 8, 5, 3, 8, 1Answer
4.
(U3-L6) A stem-and-leaf plot has the row 5 | 0 2 2 7. How many values are on that row?Answer
5.
(U3-L6) The key says 3 | 9 means 39. What number is 6 | 4?Answer

Predictions, and numbers that might be misleading.

1.
(U3-L7) A puppy weighs 6, 9, 12 and 15 pounds in weeks 1 to 4. Predict week 8.Answer
2.
(U3-L7) A puppy gains 3 pounds a week. In what week would it weigh 60 pounds if it weighed 6 in week 1?Answer
3.
(U3-L7) Can that puppy really keep gaining 3 pounds a week for its whole life? Type yes or no.Answer
4.
(U3-L8) Pay in thousands: 25, 27, 27, 29, 31, 240. Find the mean.Answer
5.
(U3-L8) For the pay above, which describes a typical worker better, the mean or the median?Answer

Real numbers: the days in each month of a year that is not a leap year. Each question says which lesson it uses.

Write your answer in a sentence or two, and say which lesson helped.

1.
A data set has a mean of 50 and a median of 20. What does that tell you about the data, and which lesson is it from?Answer
2.
A bar graph shows two bars that look very different, and the numbers beside them are 97 and 99. What did the person who drew it do?Answer

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Total / 24

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Notes

Part A — the answers.

Part B — the answers.

Part C — the answers.

Part D — the answers.

a. 3 b. 4 c. 28, February. d. 30.42 e. 31 f. 31, which appears seven times. g. 11

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

Answers vary. The mean is much bigger than the median, so at least one very large value is pulling it up, an outlier. This is from U3-L8 and U3-L5.
Answers vary. The scale probably starts near 96 or 97 instead of zero, so a gap of 2 looks huge. This is from U3-L8.