2026-08-29T08:11:50.487599 image/svg+xml Matplotlib v3.10.9, https://matplotlib.org/ © EAGLE BEACON GLOBAL The graph shows a corner shop's daily ice cream s...
Question 1 Report
The graph shows a corner shop's daily ice cream sales alongside the midday temperature recorded each day for one week.
- Write down the day with the highest sales. (1)
- Find the difference in sales between Monday and Saturday. (2)
- Work out the mean daily sales for the week, giving your answer to 3 significant figures. (1)
Answer Details
A line graph lets you read a value for each day directly from the height of the point plotted; a difference between two days is found by subtracting the smaller reading from the larger, and a mean is the total of all readings divided by how many there are.
- Reading the sales values from the graph across the week:
The highest point on the graph is on Saturday, so this is the day with the highest sales. [1]Day Mon Tue Wed Thu Fri Sat Sun Sales 12 15 28 35 40 52 45 - Monday's sales were \(12\) and Saturday's were \(52\): \[52 - 12 = 40\] [2]
- Adding all seven daily readings and dividing by \(7\): \[(12 + 15 + 28 + 35 + 40 + 52 + 45) \div 7 = 227 \div 7 = 32.428... \approx 32.4 \text{ (3 s.f.)}\] [1]
A mean uses every value in the data set, not just the highest and lowest; add all seven readings before dividing, and round only at the final step so the stated degree of accuracy is not lost early.
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