SOLUTION: It has been reported that 65 % of all internet users have been attacked by viruses. If 8 people are randomly surveyed, find the probability that exactly 5 have been attacked

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Question 1147396: It has been reported that 65 % of all internet users have been attacked by viruses. If 8 people are randomly surveyed, find the probability that exactly 5 have been attacked
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
This would be 8C5 0.65^5 *0.35^3
=56*0.00497=0.2786 rounding at the end.

Answer by ikleyn(52903) About Me  (Show Source):
You can put this solution on YOUR website!
.

Binomial distribution


    P = C%5B8%5D%5E5%2A0.65%5E5%2A%281-0.65%29%5E%288-5%29 = %28%288%2A7%2A6%29%2F%281%2A2%2A3%29%29%2A0.65%5E5%2A0.35%5E3 = 0.2786.      ANSWER