11 . A box holds 54 tomatoes . The probability that a tomato is rotten is 0.07 . Let
X be the number of rotten tomatoes in the box .
( a ) Find the expected number of rotten tomatoes in the box . [ 2 ]
( b ) Find the probability that there are exactly 9 rotten tomatoes in the box . [ 2 ]
( c ) Find the probability that there are at least 5 rotten tomatoes in the box . [ 3 ]
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