flying over the western states the mountainous terrain in a small aircraft is 40% riskier than flying over similiar distances in flatter portions of the nation according to a General accounting office study completed in response to a congressional request. The accident rate for small aircraft in the 11 mountainous western states is 2.4 per 100, 000 flight operations find the probability of no accidents in 100, 000 flight operation find the probability of at least 4 accidents in 200000 flight operations

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