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September 23, 2014

September 23, 2014

Posted by **Nora 510** on Sunday, June 2, 2013 at 11:02am.

1=.21=.79

0.79^12=0.05909

2-0.0591=1.94

- math check -
**Reiny**, Sunday, June 2, 2013 at 11:08amProb(long hair) = .21

prob(not long hair) = .79

prob(exactly 2 of 12 to have long hair)

= C(12,2) (.21^2)(.79^10) = appr .2756

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