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The frequency distribution of the weight of 100 participants in a high jump competition ...

The frequency distribution of the weight of 100 participants in a high jump competition is as shown below :
Weight (kg) 20 - 29 30 - 39 40 - 49 50 - 59 60 - 69 70 - 79
Number of Participants 10 18 22 25 16 9



(a) Construct the cumulative frequency table.
(b) Draw the cumulative frequency curve.
(c) From the curve, estimate the : (i) median ; (ii) semi- interquartile range ; (iii) probability that a participant chosen at random weighs at least 60 kg.




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