Given the Numbers are from $1$ to $15$. One number is selected
to find: Probability that the selected number is a multiple of $4$
Thus, the Total number between from $1$ to $15$ to $15$
So, Numbers that are multiple of $4$ are $4,8$ and $12$.
We know that the Probability = Number of favorable outcomes/ Total number of outcomes
Therefore, the probability of selecting a number which a multiple of $4$ is $3/15=1/5$