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# A salesperson makes 5 sales calls. The probability of a

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Manager
Joined: 29 Nov 2011
Posts: 80
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Kudos [?]: 301 [0], given: 37

A salesperson makes 5 sales calls. The probability of a [#permalink]

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28 Feb 2012, 22:57
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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?
Math Expert
Joined: 02 Sep 2009
Posts: 37691
Followers: 7413

Kudos [?]: 99908 [1] , given: 11118

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28 Feb 2012, 23:18
1
KUDOS
Expert's post
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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Joined: 24 Feb 2012
Posts: 33
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Kudos [?]: 15 [1] , given: 18

Re: A salesperson makes 5 sales calls. The probability of a [#permalink]

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28 Feb 2012, 23:39
1
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1 - [ 5c0 * (1/10)^0 * (9/10)^5 ]
Re: A salesperson makes 5 sales calls. The probability of a   [#permalink] 28 Feb 2012, 23:39
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