probability mass function

Hello all I am currently studying for university exams and stumbled upon a theoretical question while my mind was wandering (the question having nothing to do with my studies as I am in the accounting department). It has to do with multiple choice question (MCQ) tests. I wanted to figure out...

-Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is f(x)=1for0≤x≤1.), but how do I find the mean ? -Part b) Consider the following random variable and probability mass function...