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The airline tracked arrival data for 250 flights over 6 months, with 25 arriving early, 150 on time, 45 late, and 30 cancelled. The probability of a flight being early is 25/250 = 0.1, on time is 150/250 = 0.6, late is 45/250 = 0.18, and cancelled is 30/250 = 0.12. The outcomes are mutually exclusive since a flight can only be in one category. The probability of a flight being early or on time is (25+150)/250 = 0.7.