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Alle Oberthemen / Mathematics / Handling Data / AQA Module 1 (Higher)
5
How do I calculate the estimated mean of grouped data?
Given this set of data for the test marks of a class of students, find an estimate for the mean test score of the class.

Mark (m)Number of studentsMidpointFreq x midpoint
0<m≤25412.54x12.5=50
25<m≤355305x30=150
35<m≤40837.58x37.5=300
40<m≤45542.55x42.5=212.5
45<m≤60152.51x52.5=52.5
Totals:23 765

To actually calculate the mean...
Total of (frequency * midpoint) column ÷ Total Frequency
765 ÷ 23 = 33.3 (1 d.p.)


Always check your answer makes sense
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Karteninfo:
Autor: mrfoxton
Oberthema: Mathematics
Thema: Handling Data
Veröffentlicht: 18.10.2009

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