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7 cards from this deck
Shows the running total of frequencies up to each point.
Finding above/below values, ranges, comparisons.
Total - cumfreq at X
Curve is boundary; actual values lie on or below it
Vertical to curve, horizontal to axis, read cumfreq
≤70: 40; >70: 110
25% of 120 = 30; read c.f.=30 then down to axis
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