a lab network consisting of 20 computers was attack by a computer virus. this virus enters each computer with probability 0.4 independent of others. find the probability that it enters atleast 10 computers? its answer is 0.2447 but i dont know which distribution i should use ?

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i think you can use the Binomial Distribution

but i gives 0.1171

oh - i'm pretty rusty at this stuff - did you use Binomial tables?

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