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July 1, 2015

Homework Help: stats

Posted by cate on Sunday, March 10, 2013 at 8:48am.

Mothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below:

Number of Vehicles Involved
Did alcohol play a role?
1
2
3

Yes
60
110
30
200
No
40
215
45
300

100
325
75


What proportion of accidents involved more than one vehicle? Place your answer, rounded to 2 decimal places, in the blank. For example, 0.23 is a legitimate entry.

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