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A lab network consisting of 20 computers was attacked by a computer virus. This virus enters...

  1. A lab network consisting of 20 computers was attacked by a computer virus. This virus enters each computer with probability 0.8, independently of other computers.
    1. What are the expectation and variance of the number of attacked computers?
  1. Find the probability that the virus enters at most 18 computers. Show work below.  
Math   Statistics-And-Probability   
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