Answer
$0.5$
Work Step by Step
We know that $\text{probability}=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}=\frac{n(E)}{n(S)}.$
Hence, here because we have $5$ odd numbers , $n(E)=5$, therefore the probability the event $E$ is
$P(E)=\frac{5}{10}=0.5$
