Question 417977
Suppose that 40% of participants consume caffeine and smoke. 
If 8 participants are evaluated, what is the probability that:
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Binomial Problem with n= 8 and p = 0.4
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Exactly half of them consume caffeine and smoke?
P(x = 4) = 8C4*0.4^4*0.6^4 = binompdf(8,0,4,4) = 0.2322
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More than 6 consume caffeine and smoke?
P(7 <= x <=8) = 1 - binomcdf(8,0.4,6) = 0.0085
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Exactly 4 do not consume caffeine or smoke?
P(x = 4) = 8C4(0.6)^4*0.4^4 = 0.2322
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Cheers,
Stan H.
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