Based on Her Past Experience, a Professor Knows That the Probability

Multiple Choice

Based on her past experience, a professor knows that the probability distribution function for X = number of students who come to her office hours on any given Wednesday is given below.
-What is the value of P(X = 4) (the question mark in the table) ?

A) 0.05
B) 0.10
C) 0.25
D) 1