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Cumulative frequency notes
06/09/2023
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cumulative The Cumulative frequency is the total 'so far you add the frequencies up to that point. EXAMPLE The heights of some plants were recorded. Height (cm) Frequency 30<h ≤ 40 9 140<h≤50 50<h 60 604h 70 frequency 62 Height (cm) 304h ≤ 40 304h50 30Lh≤60 304h <70 16 12 3 a) Complete the cumulative frequency table. Frequency 9 25 37 40 Stove cum wative b) Draw a cumulative frequency graph. for this information. 20 10- 0 30 9+16 25+12 37+3 40 points plotted are of height reg240 and then [frequency (eg.) 9. 48 50 60 Height (cm) join the points up in a 'smooth curve MEDIAN: the middle. TO The median here is 48. last number UPPER QUARTILE 3/4 of ¾/4 of 40 the way through the data The - 30 upper quartile is $3. INTER QUARTILE RANGE difference between upper = 10 quartile is 41 53 41=12 LOWER QUARTILE 14 of the way through the 1/4 of 40 The lower data.
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