Posted by **mom** on Sunday, October 7, 2012 at 9:46am.

. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that:

(A) exactly three will have this mild side effect

(B) at least six will have this mild side effect

- statistics -
**MathGuru**, Monday, October 8, 2012 at 5:40pm
Try a binomial probability table or use a binomial probability function, which is this:

P(x) = (nCx)(p^x)[q^(n-x)]

For (A)

x = 3

n = 15

p = .20

q = .80 (q is 1-p)

For (B)

Using a table might be easier for this one. Find P(0), P(1), P(2), P(3), P(4), and P(5). Add together, then subtract from 1 for your probability.

I'll let you take it from here.

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