Decide Whether or Not the Matrix Is a Probability Vector $\left[\begin{array}{lll}\frac{1}{2} & \frac{3}{8} & \frac{1}{6}\end{array}\right]$

True/False

Decide whether or not the matrix is a probability vector.
- $\left[\begin{array}{lll}\frac{1}{2} & \frac{3}{8} & \frac{1}{6}\end{array}\right]$