Statistics and probability

Each airplane has capacity for 200 passengers, and overbooking is a common practice in these industries.

According to the historical data, each passenger will attend a flight with probability p attend = 0.9. What is the maximum number of tickets the airline can sell to ensure that no one is left behind with probability 0.75? (Hint: Use Chebychev's inequality, roots of 0.9x^2 +0.6x200 = 0 are 15.24 and 14.58).

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