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# Probability watch

1. If three different telephone calls are chosen at random, find the probability that they were made by

(i) Arif

The probability of Arif is 30/95 but I have no idea what the probability of him calling three times is. I thought 30/95^3 but apparantely this is wrong. Can anybody help.
2. Is that all there is to the question? Write it out properly.

I'd guess it's (30/95)^3 = 0.0315 (3 s.f.) too from what you've written.

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Updated: September 27, 2010
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