Week 1 Practice Quiz

Test your understanding of Random Variables.

Question 1

A fair die is rolled. Let $X$ be the number on the face. What is $E[X]$ ?

View Answer

**Answer**: 3.5 **Explanation**: $E[X] = \frac{1+2+3+4+5+6}{6} = \frac{21}{6} = 3.5$

If $X$ is a discrete random variable, can $P(X=x)$ be negative?

View Answer

**Answer**: No **Explanation**: Probabilities must be non-negative.