probability distribution

Question

A spinner that is divided into 5 equal pieces and labeled with numbers one to five inclusive is spun. What is the probability that it will land on an odd numbered piece exactly 6 times if it is spun 20 times?

Answer 1

this is a binomial experiment, where probability of landing on any one number is 1/5 and probability of landing on an odd number is 3/5 (1, 3, 5) = 0.6, there are 20 trials. Probability land on odd number 6 times.

20! 0.6^6 0.4^14

----

6! 14!