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794.32 is the answer
variance=n.p.q
here n=100 because 100 times
p=probability of happenning=no.of chances for even no/total chances=3/6=0.5
q=1-p=1-0.5=0.5
there fore variance=n.p.q=100(0.5)(0.5)=25
hence the answer is 3(1.414)
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