Among fatal plane crashes that occurred during the past 70 ​years, 577 were due to pilot​ error, 86 were due to other human​ error, 629 were due to​ weather, 219 were due to mechanical​ problems, and 493 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? Complete the relative frequency distribution below.   Cause Relative Frequency Pilot error nothing​% Other human error nothing​% Weather nothing​% Mechanical problems nothing​% Sabotage nothing​% ​(Round to one decimal place as​ needed.) What is the most serious threat to aviation​ safety, and can anything be done about​ it?   a. pilot error is the most serious threat to aviation safety b. weather is the most serious threat to aviation safety c. mechanical problems are the most serious threat to aviation safety. d. savotage is the most serious threat to aviation safety

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