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The probability of safely crossing the street in New York is

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The probability of safely crossing the street in New York is [#permalink] New post 20 Aug 2003, 06:09
The probability of safely crossing the street in New York is 0.4. If Padma crosses 3 streets everyday, What is the probability that she would safely cross one of the streets?
a. 0.064 b. 0.144 c. 0.216 d. 0.432 e. 0.936
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 [#permalink] New post 20 Aug 2003, 07:21
the answer should be 0,4... however, if we are asked whats the probability that padma is safe after crossing the 3 streets, answer is 0,4^3=0,064
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 [#permalink] New post 20 Aug 2003, 11:58
Agree..

What is the pprobability that Padma did not make it safely across the street ?
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 [#permalink] New post 20 Aug 2003, 12:39
Brainless wrote:
Agree..

What is the pprobability that Padma did not make it safely across the street ?


Short way is 1-(.4)(.4)(.4) = .936

Long way is

Prob she gets hit the first time = .6
Prob she gets hit the second time = .4*.6 = .24
Prob she gets hit the third tie = .4*.4*.6 = .096

Add those three up and you get .936
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 [#permalink] New post 20 Aug 2003, 13:32
mciatto wrote:
Brainless wrote:
Agree..

What is the pprobability that Padma did not make it safely across the street ?


Short way is 1-(.4)(.4)(.4) = .936

Long way is

Prob she gets hit the first time = .6
Prob she gets hit the second time = .4*.6 = .24
Prob she gets hit the third tie = .4*.4*.6 = .096

Add those three up and you get .936


Wonderful !!

Probability of AT LEAST one = 1 - P(NONE)
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  [#permalink] 20 Aug 2003, 13:32
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