A simple bar chart shows rainfall for 4 months: 40 mm, 60 mm, 80 mm, and 100 mm. What was the average monthly rainfall?
Answer and explanation
Correct answer: B. 70 mm
- Step 1: Total rainfall = 40 + 60 + 80 + 100 = 280 mm. Step 2. Average monthly rainfall = 280 mm ÷ 4 = 70 mm. Answer: 70 mm. Why not the others: 65 mm underestimates the sum; 75 mm assumes sum = 300; 80 mm is the third month's rainfall.
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