Question 108363
Thirteen percent of people are left handed.  You randomly select 8 persons and ask them if they are left-handed.
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Note: Probability a person is not left handed = 0.87
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Find the probability that

(a) exactly 1 person are left handed 
P(x=1) = 13C1(0.13)^1(0.87)^7 = 0.63756...
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(b) at least 1 persons are left handed,
P(x>=1) = 1 - P(x=0)
= 1 - 0.87^ 8 =  0.6717883...
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(c) less than 1 are left handed.
P(x=0) = 0.87^8 = 0.328211..
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Cheers,
Stan H.