Among fatal plane crashes that occurred during the past 50 ​years, 634 were due to pilot​ error, 95 were due to other human​ error, 109 were due to​ weather, 438 were due to mechanical​ problems, and 204 were due to sabotage.     Construct the relative frequency distribution. What is the most serious threat to aviation​ safety, and can anything be done about​ it?

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