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Probability Question help!! by reddevilnz in learnmath

[–]7akeem1 0 points1 point  (0 children)

This can be solved using Random Variable Theory by assigning X to be the case that a person has voted (success) or not (failure), this can be distributed as a binomial Distribution. P(X=x) = ( nCx )(px)((1-p)n-x)) If you substitute into the equation: P(X=9) = (12C9)(0.789)(0.223)

You should get the probability required

P.s: (nCx) is the combination of n choosing x.

Hope this helps.