Task 4 - Extension Cumulative Frequency
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4Task 4 – Extension Cumulative Frequency
1.
An operator took 100 calls at a call centre.
The table gives information about the time (t seconds) it took the operator to answer each call.
Time (t seconds)
Frequency
0 < t ≤ 10
16
10 < t ≤ 20
34
20 < t ≤ 30
32
30 < t ≤ 40
14
40 < t ≤ 50
4
(a) Complete the cumulative frequency table.
Time (t seconds)
Cumulative Frequency
0 < t ≤ 10
16
0 < t ≤ 20
0 < t ≤ 30
0 < t ≤ 40
0 < t ≤ 50
(b)
On the grid, draw a cumulative frequency graph for your table.
(c)
Use your graph to find an estimate for the number of calls the operator took more than
18 seconds to answer......................................
(2)
(Total 5 marks)
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