Edexcel IAL Mathematics S1.2.3 measures of dispersion
Practise calculating and interpreting spread using range, IQR, variance and standard deviation from raw or summarised data.
- Syllabus
- First assessment 2019
- Course
- Mathematics YMA01
- Level
- AS
Exam points
- calculate standard deviation or variance from Σx and Σx², then round appropriately
- find range, quartiles or IQR, including interpolation where grouped data is given
- interpret how a shift, scale change or added data affects variance or standard deviation
S1.2.3 - Measures of dispersion – variance, question 1
The histogram shows the times taken, in seconds, by each of 260 people to complete a puzzle.
find an estimate for
the standard deviation of the times taken to complete the puzzle.
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