Respuesta :

Frequency is the number of occurrences of a repeating event.

Here we have the events:

shopping time between occurences frequency

18 to 22: 20, 18 2

23 to 27: 27, 24, 26, 24, 24 5

28 to 32 29, 31 2

33 to 37 37, 34, 35, 33, 36, 32 6

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Universidad de Mexico