Given a sample space $S = \{1, 2, 3, 4, 5, 6\}$ with $P(1)=P(2)=0.1$, $P(3)=P(4)=0.2$, and $P(5)=P(6)=0.2$. What is the probability of the event $E = \{x \in S : x \text{ is odd}\}$?