# Question: For 50 airplanes that arrived late at an airport during

For 50 airplanes that arrived late at an airport during a week, the time by which they were late was observed. In the following table, x denotes the time (in minutes) by which an airplane was late, and f denotes the number of airplanes.

x f

0 to less than 20......... 1 4

20 to less than 40......... 18

40 to less than 60......... 9

60 to less than 80......... 5

80 to less than 10......... 0 4

Find the mean, variance, and standard deviation.

x f

0 to less than 20......... 1 4

20 to less than 40......... 18

40 to less than 60......... 9

60 to less than 80......... 5

80 to less than 10......... 0 4

Find the mean, variance, and standard deviation.

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