Edexcel Gcse Mathematics (Linear) - Cumulative Frequency Page 8
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4. The table gives some information about the delays, in minutes, of 80 flights.
Delay
Frequency
(n minutes)
0 < n
20
16
26
20 < n
30
23
30 < n
40
40 < n
50
10
50 < n
60
5
(a) Write down the modal class interval.
.....................................
(1)
(b) Complete the cumulative frequency table.
Delay
Cumulative
(n minutes)
Frequency
0 < n
20
0 < n
30
0 < n
40
0 < n
50
0 < n
60
(1)
(c) On the grid opposite, draw a cumulative frequency graph for your table.
(2)
(d) Use your graph to find an estimate for
(i) the median delay,
........................ minutes
(ii) the interquartile range of the delays.
........................ minutes
(3)
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