An NBA player makes a successful free-throw 80% of the time. Find the probability that he is successful at least 4 times in 5 attempts?

Answer 1

we want the prob of
4 out of 5 + 5 out of 5
= C(5,4)(.8^4)(.2) + C(5,5) (.8^5)
= .4096 + .32768
= .73728