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November 28, 2014

November 28, 2014

Posted by **Elizabeth** on Tuesday, May 29, 2007 at 1:37pm.

In a 200 m swimming race between 8 boys, the probability of Omar winning the race if he is in one of the two outside lanes is 1/4. If he is in any of the other lanes, the probability of Omar winning is 1/3.

If the lanes are drawn at random, what is the overall probability of Omar winning the race?

Thank you

Consider that there are 2/8 probability of getting an outside lane. To get the probability that both (all) events would happen, you need to multiply the probabilities of the individual events (2/8*1/4).

Do the same for the 6 inside lanes.

However, he can be placed in either the inside or outside lanes. In the case of "either-or" probabilities, you add the probabilities of the individual events.

I hope this helps. Thanks for asking.

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