Points: 0 of 1 Among fatal plane crashes that occurred during the past 55 years, 504 were due to pilot error, 87 were due to other human error, 468 were due to weather, 155 were due to mechanical problems, and 557 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 Plot error Other human error Weather Mechanical problems Sabotage Relative Frequency (Round to one decimal place as needed.)