Edexcel Gcse Mathematics (Linear) - Cumulative Frequency Page 6
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3. A company tested 100 batteries.
The table shows information about the number of hours that the batteries lasted.
Time (t hours)
Frequency
50 < t < 55
12
55 < t < 60
21
60 < t < 65
36
65 < t < 70
23
70 < t < 75
8
(a) Complete the cumulative frequency table for this information.
(1)
Cumulative
Time (t hours)
frequency
50 < t < 55
12
50 < t < 60
50 < t < 65
50 < t < 70
50 < t < 75
(b) On the grid, draw a cumulative frequency graph for your completed table.
(2)
(c) Use your completed graph to find an estimate for the median time.
You must state the units of your answer.
.........................................
(2)
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