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adriana
Average Member

USA
8 Posts

Posted - 10/17/2007 :  15:56:48  Show Profile
A recent survey claimed that 80% of the troops in Iraq believe that their mission is primarily to retaliate for Saddam's role in the 9/11 attacks. Assuming the claim is accurate.

a)if fourteen troops are selected at random, find the probability that exactly twelve believe that their mission is primarily to retaliate for Saddam's role in the 9/11 attacks.
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tkhunny
Advanced Member

USA
1001 Posts

Posted - 10/17/2007 :  16:41:31  Show Profile
This is a nice binomial distribution.

p = 0.80
q = 1-p = 0.20
n = 14

Pr(14) = p^14

Pr(13) = 14*(p^13)(q^1)

Pr(12) = ??*(p^12)(q^2)
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