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June 7th, 2012, 01:37 PM   #1
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permutation and combination

ratio male to female is 0.53 . family of 7 children
i-what is the probability that all(7) children are boy
ii-are girl
iii-5 girls , 2 boys
thank you
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June 7th, 2012, 03:08 PM   #2
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Re: permutation and combination

Hello, talo0000!

Quote:
Ratio of male to female is 0.53.






Quote:
There is a family of 7 children.
(a) What is the probability that all 7 children are boys?




Quote:
(b) all girls?




Quote:
(c) 5 girls, 2 boys



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June 7th, 2012, 05:39 PM   #3
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Re: permutation and combination

Talo0000, did you mean that there are 53 males for every 100 females or that 53 out of 100 children are male?
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June 8th, 2012, 06:47 AM   #4
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Re: permutation and combination

thank you for your quick response
but the relation is for every 100 case 53 male and 47 female , usually the relation is one-to-one , but for this special case is .53 to .47
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June 8th, 2012, 02:32 PM   #5
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Re: permutation and combination

Quote:
Originally Posted by talo0000
thank you for your quick response
but the relation is for every 100 case 53 male and 47 female , usually the relation is one-to-one , but for this special case is .53 to .47
Use the same formulae and just change the raw probabilities used. So, all seven are boys would be .53^7 All seven are girls would be .47^7, etc
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