A candy company claims that its jelly bean mix contains 15% blue jelly beans. Suppose that the candies are packaged at random in small bags containing about 200 jelly beans. What is the probability that a bag will contain more than 20% blue jelly beans?

(This is an open ended question, so if possible can you let me know which equation you used and which numbers fill what? I am having a very hard time understanding this and it is gibberish in my brain). Thank you for your time.