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Probability

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by saurabhmahajan » Tue May 11, 2010 8:52 pm
There is 30% chance of rain & 70% chance of shine.If it rains then there are 50% chance that bob will cancel his picnic,but if the sun is shining bob will go for picnic.What is the chance that bob will have his picnic.? (mention in percentage)

a) 40%
b) 65%
c) 85%
d) 90%
e) 100%
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Source: — Problem Solving |

by liferocks » Tue May 11, 2010 9:00 pm
probability of bob having picnic is

0.3*0.5+0.7*1=0.7+0.15=0.85 or 85%

Ans option C
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