Decide Whether or Not the Matrix Is a Probability Vector $\left[\begin{array}{rrr}0.3 & 0.7 & 0.7\end{array}\right]$

True/False

Decide whether or not the matrix is a probability vector.
- $\left[\begin{array}{rrr}0.3 & 0.7 & 0.7\end{array}\right]$