Data Interpretation • Topic 1 of 5

Tables

A table lists exact values in rows and columns — the cleanest DI form because no reading-off-a-scale error is possible. Scan the row/column headers first so you know where each number lives, then answer with totals, averages, ratios or percentages. Watch the units stated in the caption.

✅ Solved examples

1. A shop sold (in units) Mon 20, Tue 25, Wed 15, Thu 30, Fri 10. Total for the week?
20+25+15+30+10 = 100.
2. From the same data, the average daily sale?
100 / 5 = 20.
3. What percent of the week's sales happened on Thursday?
30/100 x 100 = 30%.
4. Ratio of Monday to Wednesday sales?
20:15 = 4:3.

✏️ Practice — try these, take hints as needed

1. Values 12, 18, 20, 10. Total?
Add.
—
—
60
2. Average of 12, 18, 20, 10?
Sum 60 / 4.
—
—
15
3. 18 is what percent of total 60?
18/60.
x 100.
—
30%
4. Ratio 20 : 10?
Simplify.
—
—
2:1
5. Highest minus lowest among 12,18,20,10?
20 - 10.
—
—
10

📝 Topic test — 8 questions

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