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# Binomial Distribution question help?

side effects 9% of those who take it. Among 10 people taking this drug, what is the probability that exactly 2 people will experience adverse side effects?

how to do this question please show me steps

### 2 Answers

- Wayne DeguManLv 71 month ago
If two people suffer side effects then eight don't

As the ten people are independent then we have:

(0.09)² x (0.91)⁸...which is only one possible combination

Choosing two from 10 we have 10C2 combinations in total

Hence, 10C2 x (0.09)² x (0.91)⁸ => 0.171

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