Answer:
![68\%](https://tex.z-dn.net/?f=68%5C%25)
Step-by-step explanation:
Let <em>A</em> be the event that Daniel receives call from SeaWorld.
Probability of event <em>A</em>, <em>P(A)</em> =
Let <em>B</em> be the event that Daniel receives call from Central Park Zoo.
Probability of event <em>B</em>, <em>P(B) </em>= ![48\%](https://tex.z-dn.net/?f=48%5C%25)
Probability that Daniel receives calls from both SeaWorld and Central Park Zoo:
![P(A \cap B) = 15\%](https://tex.z-dn.net/?f=P%28A%20%5Ccap%20B%29%20%3D%2015%5C%25)
We know that formula:
Probability that Daniel receives call from either SeaWorld or Central Park Zoo but not both:
![P(A \cup B) = P(A) + P(B) - P(A \cap B)\\\Rightarrow P(A \cup B) = 35\% + 48\% - 15\%\\\Rightarrow P(A \cup B) = 68\%](https://tex.z-dn.net/?f=P%28A%20%5Ccup%20B%29%20%3D%20P%28A%29%20%2B%20P%28B%29%20-%20P%28A%20%5Ccap%20B%29%5C%5C%5CRightarrow%20P%28A%20%5Ccup%20B%29%20%3D%2035%5C%25%20%2B%2048%5C%25%20-%2015%5C%25%5C%5C%5CRightarrow%20P%28A%20%5Ccup%20B%29%20%3D%2068%5C%25)
Hence, required probability is
.