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What percentage of planes in sample more than eight minutes

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Reference no: EM132985573

Tiger Airlines claims that at least 80% of its planes arrive at the airport within 8 minutes of the scheduled time.

To investigate the accuracy of this claim a student who is studying statistics, records the amount of time that each plane arrives late. After rounding each time to the nearest minute, she obtains the following frequency table:

Minutes Late                 Frequency
0                                  12
1                                  13
3                                   8
4                                   2
5                                  10
6                                  15
7                                  20
8                                   5
9                                   14
10                                 1

Problem (i) What percentage of planes in the sample are more than eight minutes late?

Problem (ii) Should the student agree with Tiger Airlines claim? Give reasons for your answer.

Reference no: EM132985573

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