# EM activity

1. What are $\displaystyle \textbf{z}$ , $\displaystyle \textbf{x}$ and $\displaystyle \theta$  ?
2. What is $\displaystyle P(\textbf{x} | \textbf{z} \theta)$
3. What is $\displaystyle P(\textbf{z} | \textbf{x} \theta')$  ?
4. What is $\displaystyle P(\textbf{z} | \theta)$  ?