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The probability that event M will not occur is 0.8 and the probability

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Intern
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B
Joined: 12 Sep 2018
Posts: 3
Re: The probability that event M will not occur is 0.8 and the probability  [#permalink]

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New post 24 Oct 2018, 16:13
mskx wrote:
How to you calculate P(M and R) that you get 0?

or means add
and means multiply

To stay with your example:
P(M or R) = P(M) + P(R) - P(M and R)
P(M or R) = P(0.9) + P(0.9) - P(0.9*0.9) -> 0.9*0.9 is not 0
But please consider that P(M or R) = P(M) + P(R) -P(M and R) is wrong because its a mutually exclusive event.


Because they're mutually exclusive, P(M and R) can't happen. That's why I used 0. So really it's P(M or R)=P(M) + P(R). If P(M) and P(R) are each 0.9 (mutually exclusive of course), the P(M or R) becomes 1.8, which is what doesn't make sense to me.
Manager
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S
Joined: 24 Dec 2017
Posts: 179
Location: India
Concentration: Strategy, Real Estate
Schools: Johnson '21
Re: The probability that event M will not occur is 0.8 and the probability  [#permalink]

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New post 24 Oct 2018, 23:19
M will not occur = 0.8
M will occur = 0.2

R will not occur = 0.6
R will occur = 0.4

Probability that either event M or event R will occur = 0.2 + 0.4 = 0.6 (3/5)

Hence C
GMAT Club Bot
Re: The probability that event M will not occur is 0.8 and the probability &nbs [#permalink] 24 Oct 2018, 23:19

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