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probability of perfect score

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probability of perfect score

by saurabhmahajan » Tue May 11, 2010 8:56 pm
In a diving competition each diver has a 20% chance of a perfect dive.The first perfect dive of the competition,but no subsequent dives will recieve a perfect score.If Janet is the third diver to dive,what are her chances of recieving a perfect score?

a) 20 %
b) 12.8%
c) 15.5%
d) 25%
e) 30%
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by liferocks » Tue May 11, 2010 9:16 pm
probability of the driver of first and second slot not making perfect drive =0.8*0.8=0.64

probability of Janet making perfect drive is 0.2

so chances of Janet receiving perfect score=0.64*0.2=0.128 or 12.8%

Ans option B
"If you don't know where you are going, any road will get you there."
Lewis Carroll
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