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There is a 30% chance of rain and 70% chance of shine. If it

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There is a 30% chance of rain and 70% chance of shine. If it [#permalink]

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New post 28 Sep 2008, 03:23
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There is a 30% chance of rain and 70% chance of shine. If it rains, there is a 50% chance that Bob will cancel his picnic. What is the chance that Bob will have his picnic ?
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Kudos [?]: 738 [0], given: 1

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Kudos [?]: 454 [0], given: 1

Re: PS: Will Bob have his picnic today ? [#permalink]

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New post 28 Sep 2008, 08:23
amitdgr wrote:
There is a 30% chance of rain and 70% chance of shine. If it rains, there is a 50% chance that Bob will cancel his picnic. What is the chance that Bob will have his picnic ?


the chance that Bob will have his picnic
=

shines and bob has his picnic + rains and bob has his picnic

70/100 X 1 + 30/100 X 50/100 = 85%

Kudos [?]: 454 [0], given: 1

Re: PS: Will Bob have his picnic today ?   [#permalink] 28 Sep 2008, 08:23
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There is a 30% chance of rain and 70% chance of shine. If it

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