Foundation
13th March 2026
- 1Index Numbers
A cost index for electricity, relative to the same base year, was 120 in 2021 and 150 in 2023. Find the percentage increase in the cost of electricity from 2021 to 2023 (not from the base year).
- 2Frequency Tables and Tally Charts
A tally shows 4 full groups of five plus 2 extra marks for one category. What is the frequency?
- 3Time Series and Moving Averages
Find the 4-point moving average of 8, 12, 16, 20.
- 4Grouped Frequency Tables
Why must class intervals in a grouped frequency table not overlap?
- 5Pictograms
A pictogram key shows 1 symbol = 6 cakes. A row has 1 symbol and a third of a symbol. How many cakes does the row represent?
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