A random variable X has the probability distribution :

$\begin{array}{ccccccccc}X:& 1& 2& 3& 4& 5& 6& 7& 8\\ P\left(x\right):& 0.15& 0.23& 0.12& 0.10& 0.20& 0.08& 0.07& 0.05\end{array}$

For the events $E=\{X$ is a prime number} and $F=\left\{X<4\right\}$, the probability $P\left(E\cup F\right)$ is