11) At an airport, 78% of recent flights have arrived on time. A sample of 11 flights is studied. Find the probability that exactly 7 of them were on time. 12) At an airport, 78% of recent flights have arrived on time. A sample of 11 flights is studied. Find the probability that less than 7 of them were on time.
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78^7 \times (1 - 0.78)^{11-7} \] Show more…
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