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An investigation compiled information about recent nonmilitary plane crashes (www. planecrashinfo.com). The causes, to the extent that they could be determined, are summarized in the table. Cause Percent Pilot error 40 Other human error 5 Weather 6 Mechanical failure 14 Sabotage 6 a) Is it reasonable to conclude that the weather or mechanical failures caused only about 20 % of recent plane crashes? b) In what percent of crashes were the causes