7. A tour company makes trips to see dolphins in the morning and in the afternoon.
The two-way table summarizes whether or not customers saw dolphins on a total
of 40 different trips.
dolphins
no dolphins
morning
19
3
afternoon
14
4
a. If a trip is selected at random, what is the probability that customers did
not see dolphins on that trip?
b. If a trip is selected at random, what is the probability that customers did
not see dolphins under the condition that the trip was in the morning?
c. Are the events of seeing dolphins and the time of the trip (morning or
afternoon) dependent or independent events? Explain your reasoning.