Discussion
The line chart given below shows the number of calculator sold by five shops.
What is the average number of calculators sold by all shops?
Answer: B
The line chart gives the numbers of calculators sold by the five shops as 20, 50, 75, 125 and 100. Their sum is 20 + 50 + 75 + 125 + 100 = 370, and the average over the five shops is 370 / 5 = 74. So the answer is 74, option (B). The values 76, 72 and 78 would need totals of 380, 360 and 390, which do not match the chart, and the point of 125 for the fourth shop is the highest while 20 for the first is the lowest.
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