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a. p(x>3)
=0.12+0.04
=0.16
b. p(x=0,1,2)
=p(x=2)
=0.48
Mean
=(2*0.48)+(3*0.36)+(4*0.12)+(5*0.04)
=2.72
Variance
=0.248832+0.028224+0.196608+0.207936
=0.6816
std. deviation = square root of variance
=0.82559
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