Cumulative frequency diagrams 2 (Edexcel GCSE Statistics): Flashcards
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What does a cumulative frequency diagram show?
What does a cumulative frequency diagram show?
Shows the running total of frequencies up to each point.
What are common questions in cumulative frequency problems?
What are common questions in cumulative frequency problems?
Finding above/below values, ranges, comparisons.
How to get 'more than X' from the curve?
How to get 'more than X' from the curve?
Total - cumfreq at X
Why are values from cumulative curves estimates?
Why are values from cumulative curves estimates?
Curve is boundary; actual values lie on or below it
Steps to read cumfreq at value X from curve?
Steps to read cumfreq at value X from curve?
Vertical to curve, horizontal to axis, read cumfreq
Total 150; cf at 70 = 40. Find '≤70' and '>70' counts.
Total 150; cf at 70 = 40. Find '≤70' and '>70' counts.
≤70: 40; >70: 110
Convert 25% of 120 to a cumulative frequency
Convert 25% of 120 to a cumulative frequency
25% of 120 = 30; read c.f.=30 then down to axis