Stephen rolls a fair dice 78 times. How many times would Stephen expect to roll a number greater than 2?

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Joanie watched 1 out of three of a movie in the morning

Can someone me immediately, this is due by midnight! if you can't see the question, i'll text it to you. show the steps you took to get your answer.