Question 1110577
{{{P(X)=C(12,X)*(0.28)^X*(1-0.28)^(12-X)}}}
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*[illustration fer1.JPG].
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a){{{P(X=3)=0.217}}}
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b) {{{P(X>=4)=P(4)+P(5)+P(6)+P(7)+P(8)+P(9)+P(10)+P(11)+P(12)}}}
{{{P(X>=4)=0.592}}}
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c) {{{P(X<8)=P(0)+P(1)+P(2)+P(3)+P(4)+P(5)+P(6)+P(7)}}}
{{{P(X<8)=0.983}}}