(a). P=0.2,n= 12
"E(x)=np =12\\times{0.2}=2.4"
(b). "p(\\le2)"
"p(\\le2)" can be obtained from =BINOM.DIST(2,12,0.2,TRUE) excel formula, which yields 0.558346
(c). P=3
P=3 can be obtained from =BINOM.DIST(3,12,0.2,FALSE) excel formula, which yields 0.236223
(d). "P(\\ge4)"
"P(\\ge4)=1-P(\\le3)"
"P(\\le3)" can be obtained from =BINOM.DIST(3,12,0.2,TRUE) excel formula, which yields 0.794569 . thus, "P(\\ge4)=1-0.794569=0.205431"
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