Among fatal plane crashes that occurred during the past 70 years, 611 were due t

Question

Among fatal plane crashes that occurred during the past 70 years, 611 were due to pilot error, 71 were due to other human error, 122 were due to weather, 521 were due to mechanical problems, and 427 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.)

Cause

Relative

Frequency

Pilot error

nothing%

Other human error

nothing%

Weather

nothing%

Mechanical problems

nothing%

Sabotage

nothing%

Explanation / Answer

By formula relative frequency=value assigned to each class (f)/total number of values (N)

Cause                                         Frequency                             Relative frequency

Pilot error                                     611                                         611/(611+…+427)=611/1752=0.35=35%

Other human error                         71                                           71/1752=0.04=4%

Weather                                       122                                         122/1752=0.07=7%

Mechanical problems                     521                                         521/1752=0.30=30%

Sabotage                                       427                                         427/1752=0.24=24%

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