The cumulative frequency graph shows information about the length, in minutes, of cach of 80 films. 80 70 60 50 Cumulative frequeney 40 30 20 10 80 90 100 110 120 130 140 Length (minutes) a) Use the graph to find an estimate for the interquartile range. b) Mahmoud says, “More than 35% of these films are over 120 minutes long." Is Mahmoud correct? Give a reason for your answer.

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The cumulative frequency graph shows information about the length, in minutes, of each of 80 films.
80
70
60
50
Cumulative
frequeney
40
30
20
10
90
100
110
120
130
140
Length (minutes)
a) Use the graph to find an estimate for the interquartile range.
b) Mahmoud says, “More than 35% of these films are over 120 minutes long."
Is Mahmoud correct? Give a reason for your answer.
Transcribed Image Text:The cumulative frequency graph shows information about the length, in minutes, of each of 80 films. 80 70 60 50 Cumulative frequeney 40 30 20 10 90 100 110 120 130 140 Length (minutes) a) Use the graph to find an estimate for the interquartile range. b) Mahmoud says, “More than 35% of these films are over 120 minutes long." Is Mahmoud correct? Give a reason for your answer.
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