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Frequency tables organise raw data into categories or class intervals for analysis. Students must construct tables, calculate totals, and use them to find averages and draw statistical diagrams.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Creating overlapping class intervals (e.g., 10-20, 20-30 instead of 10-19, 20-29)
Forgetting to multiply frequency by value before summing for the mean
Misreading the question about whether to use upper, lower or midpoint values
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Averages are fundamental to data analysis. Students must calculate mean, median, mode and range from raw data, frequency tables and grouped data, and understand which average is most appropriate in different contexts.
StatisticsHistograms display continuous grouped data using bars whose area (not height) represents frequency. This higher-tier topic requires students to calculate frequency density and interpret histograms with unequal class widths.
StatisticsCumulative frequency diagrams show running totals and are used to estimate the median, quartiles and interquartile range. Students draw the characteristic S-shaped curve and read off values at key percentile positions.
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