Among fatal plane crashes that occurred during the past 55 years. 227 were due to pilot error, 60 were due to other human error, 660 were due to weather, 681 Were due to mechanical problems, and 31 0 Were due to sabotage. Ch, 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 11222, Pilot error D% Other human error E% Weather D'Vo Mechanical problems D'Vo Sabotage D% (Round to one decimal place as needed.)