A binomial distribution has a 60% rate success.There are 18 trials
1) What is the probability that there will be at least 12 success?
2) What is the probability that there will be 12 failures ?
3) What is the expected number of successes?

Question

A binomial distribution has a 60% rate success.There are 18 trials
 1) What is the probability that there will be at least 12 success?
 2) What is the probability that there will be 12 failures ?
 3) What is the expected number of successes?

anonymous · Answer

just fill in the pdf: http://www.wolframalpha.com/input/?i=binomial+distribution+pdf

anonymous · Answer

I don't get

anonymous · Answer

Do you see the formula on the page? P(X=x) gives the probability of x successes. So you fill in the formula: n=18, p=0.6, x=12 for the first question.