5 . A fair eight-faced die with numbered faces 1 , 2 , 3 , 4 , 5 , 6 , 7 and 8 is tossed for thirteen times .
( a ) Find the expected number of multiples of 3 landed .
( b ) Find the variance of the number of multiples of 3 landed .
( c ) Find the probability that the number of multiples of 3 landed is 8 .
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