Probability Distribution Function (PDF) for a Discrete Random Variable · Exercise 8

A baker is deciding how many batches of muffins to make to sell in his bakery. He wants to make enough to sell every one and no fewer. Through observation, the baker has established a probability distribution.
$$\begin{array}{cc}\text{x}& \text{P(x)}\\ \text{1}& \text{0.15}\\ \text{2}& \text{0.35}\\ \text{3}& \text{0.40}\\ \text{4}& \text{0.10}\end{array}$$

What is the probability the baker will sell exactly one batch? P(x = 1) = _______

This exercise has fill-in blanks from its source book and no answer key.

OpenStax, Introductory Statistics 2e · §4.1 Probability Distribution Function (PDF) for a Discrete Random Variable · Exercise 8