Binomial distribution calculation, need help

twobeatsoff

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Not sure how to go about answering this...

"A physician administers a new drug to 20 people with a certain disease. The probability is .15 that the drug will cure each person, and the result for one person is independent of the result for any other person.

What is the expected value of the number of people in the sample who are cured?"
 
"A physician administers a new drug to 20 people with a certain disease. The probability is .15 that the drug will cure each person, and the result for one person is independent of the result for any other person. What is the expected value of the number of people in the sample who are cured?"
This is simply binomial probability.
If one has the \(\displaystyle p\) probability of success in independent trials then the expected value of success in \(\displaystyle N\) trials is \(\displaystyle E=N\cdot p~.\)
 
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