Intro Stats Problem.

#1
A student takes a true or false test with 15 questions. He guesses on every question.

1) Find the probability that he gets atleast 1 question right
2) Find the probability he gets 60% or higher.

I am stuck. I know it is something with perms and coms. Any help would be great.
 
#3
No, it isn't in the chapter of this textbook, so I'm assuming its not used. Im just trying to read the textbook examples and try to figure it out but I can seem to get any answer that makes sense.
 

Dason

Ambassador to the humans
#4
Well the binomial distribution makes things easier it looks like this question is basically asking you to derive and use the binomial distribution which is entirely possible based on first principles.

Hint for question 1: Can you figure out the probability that they get 0 correct is?