A probability distribution stands that the addition of all the probabilities presented in the distribution must be equal to 1.
According to this the missing value when x is equal to 6, should be the substraction of 1 and the rest of the probabilities from the distribution
![\begin{gathered} P(x=6)=1-0.28-0.28-0.3 \\ P(x=6)=1-0.86 \\ P(x=6)=0.14 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/sshjs7qh0z6ai0x6jinisp3n36kbapfd2y.png)