Compare two towns' onion prices using minimum, maximum, total, range and mean, and see the spread on a dot plot.
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Minimum, maximum, total, range and mean each tell part of the story.
Monthly price of onions (₹ per kg):
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yahapur | 25 | 24 | 26 | 28 | 30 | 35 | 39 | 43 | 49 | 56 | 59 | 44 |
| Wahapur | 19 | 17 | 23 | 30 | 38 | 35 | 42 | 39 | 53 | 60 | 52 | 42 |
Averages and spread for Yahapur and Wahapur.
Problem. Find the average price of onions in each town. Which is costlier? (Math Talk, Textbook p. 104)
Decide which onion arguments are fair.
Khushboo uses only the highest price, ₹60. Is that enough to decide?
Each value becomes a dot on a number line; repeats stack up.
A dot plot puts each data value as a dot above a number line. If a value appears twice, the second dot stacks on the first.
Both towns' 12 prices on one dot plot.
Problem. Show all 24 onion prices on one dot plot from 10 to 60. (Textbook p. 103)
Ask your own questions about onion prices.
Math Talk, Textbook p. 104. Looking at how onion prices change over the year can make you curious. For example: Do the seasons affect the price? Where are these two towns? How do price swings affect farmers?
Write two questions you are curious about, and one way you could find out.
Something you wonder about.
Something else.
What data would you collect, or whom would you ask?