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Shop A sold 205 phones in a month, and Shop B sold 200.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Shop A sold 205 phones in a month, and Shop B sold 200. An advert shows a bar chart whose vertical axis starts at 195.
- Above 195, how many times as tall does Shop A's bar look as Shop B's?
- In fact, by what percentage did Shop A sell more than Shop B?
- How should the chart be drawn?
Need a reminder? The key ideaShow
A bar must start at zero. If the axis starts higher, a small difference looks large.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. What the eye sees. Above 195, the bars are and tall. Shop A's bar looks times as tall.
Step 2. The truth. Shop A sold more phones, which is more.
Step 3. An honest chart. Start the axis at . Then the bars are 205 and 200 tall and look almost equal, which is the truth.
Answer: twice as tall; only more; start the axis at zero.
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