Among fatal plane crashes that occurred during the past 50 years, 434 were due to pilot error, 64 were due to other human error, 197 were due to weather, 634 wore due to mechanical problems, and 670 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. Relative Cause Frequency Pilot error Other human error Weather % Mechanical problems 1% Sabotage (Round to one decimal place as needed.)