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A salesperson makes 5 sales calls. The probability of a

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A salesperson makes 5 sales calls. The probability of a [#permalink] New post 28 Feb 2012, 21:57
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A salesperson makes 5 sales calls. The probability of a successful sales call is 10%. What is the likelyhood the salesperson makes at least 1 successful sales call?
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Re: Probability [#permalink] New post 28 Feb 2012, 22:18
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Smita04 wrote:
A salesperson makes 5 sales calls. The probability of a successful sales call is 10%. What is the likelyhood the salesperson makes at least 1 successful sales call?


Since the probability of a successful sales call is 10% then the probability of an unsuccessful sales call is 90%.

P(at least one)=1-P(none)=1-(0.9)^5.
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Re: A salesperson makes 5 sales calls. The probability of a [#permalink] New post 28 Feb 2012, 22:39
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Re: A salesperson makes 5 sales calls. The probability of a   [#permalink] 28 Feb 2012, 22:39
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