Statistics - Module 6 - Exponential Probability Distribution - Problem 6-4C

Module 6 examines continuous probability distributions. We will examine the properties and applications of a uniform, a normal, and an exponential probability distribution. In some cases, there exists a relationship between continuous probability distributions and their discrete counterparts. For example, we will learn how the exponential and the poisson distributions are related as well the normal and the binomial distributions.

[Bwie]

This might sound dumb but, can the question asks for less than 15 minutes (P(x < 15) instead of P(x <=15))? If yes, does it affect the answer?