Question: Here is a frequency table summarising an airport's weekly passenger data (thousands) for a sample of weeks over the past three years: Weekly Passengers (000's)

Here is a frequency table summarising an airport's weekly passenger data (thousands) for a sample of weeks over the past three years:

Weekly Passengers (000's)

Frequency

(10, 15]

25

(15, 20]

22

(20, 25]

21

(25, 30]

25

For what fraction of weeks were passenger numbers less than or equal to 15 thousand?

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