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November 08, 2025, 05:18:50 am
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Author Topic: Probability Question  (Read 743 times)  Share 

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nacho

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Probability Question
« on: September 18, 2011, 09:17:06 pm »
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Straight out of mathsquest:

"If Pr(A) = 4 Pr(B), Pr(A U B ) = 0.8 and Pr(intersection A, B) = 0.2
find Pr(B)
and Pr(A)"

im guessing Pr(A) = 4 Pr(B) means 4 times pr(b) ?
okay im an idiot, nvm i got it :D
« Last Edit: September 18, 2011, 09:22:23 pm by nacho »
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Re: Probability Question
« Reply #1 on: September 18, 2011, 09:26:20 pm »
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yeah so Pr(A) = 0.2?
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nacho

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Re: Probability Question
« Reply #2 on: September 18, 2011, 09:28:27 pm »
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Quote from: ssNake on September 18, 2011, 09:26:20 pm
yeah so Pr(A) = 0.2?
Pr(B) = 0.2, i think thats what you mean? :P
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Re: Probability Question
« Reply #3 on: September 18, 2011, 09:30:46 pm »
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yep. -.-

Let Pr(B) = x

0.8 = 4x + x - 0.2
0.8 = 5x - 0.2
5x = 1
x = 0.2
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