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If two students are chosen at random with replacement from

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If two students are chosen at random with replacement from [#permalink] New post 03 Oct 2003, 13:49
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By the way... we don't see too many females on this boards do we? :?

Anyway... back to our thing:

If two students are chosen at random with replacement from a certain class, what is the probability that two male students or two female students are selected?

1) There are 50 male students in the class.
2) The probability of selecting one male and one female student is 21/50.
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Re: DS - Males and Females [#permalink] New post 03 Oct 2003, 14:28
MartinMag wrote:
By the way... we don't see too many females on this boards do we? :?

Anyway... back to our thing:

If two students are chosen at random with replacement from a certain class, what is the probability that two male students or two female students are selected?

1) There are 50 male students in the class.
2) The probability of selecting one male and one female student is 21/50.


Good One!

Answer B

Prob ( two males) = 1- P(two females) - P(Male and female)

it follows that

P(2 M) + P(2F) = 1 - P(male and female)
= 29/50


Thanks
praetorian
Re: DS - Males and Females   [#permalink] 03 Oct 2003, 14:28
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