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.
