If Mrs Fabloo has five children, what is the probability that at least two of them are boys
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If Mrs Fabloo has five children, what is the probability that at least two of them are boys

[From: ] [author: ] [Date: 13-01-30] [Hit: ]
However i also get another feeling and thus another answer of 0.49. so help me please, please, please.addReport Abuse -You need to work this sort of problem backwards.......
I think it's a trick question.... so i believe that it is 1/2. However i also get another feeling and thus another answer of 0.49. so help me please, please, please.

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there are 2^5 = 32 possible outcomes of which
0 boys: 1/32
1 boy (could be any of the 5 children): 5c1/32 = 5/32

P[at least 2 boys] = 1 - P[≤1 boy] = 1 - 6/32 = 13/16 <--------

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P[0] = 1/32
P[1] = 5/32
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You need to work this sort of problem "backwards". Figure the probability of NOT meeting the condition and subtract that result from 1.00

To have fewer than two boys, at least four of them must be girls. To have four girls, the probability is:

(1/2) * (1/2) * (1/2) * (1/2) = 1/16 or 0.0625

Subtracting the from 1.00 results in a 0.9375 chance of having two or more boys.

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