5×15= 75 the 4 days is irrelevant
18/2,27/3,36/4,45/5,54/6,63/7,72/8, and 81/9 can be some.
Answer:

Step-by-step explanation:
The question illustrates a binomial distribution and the given parameters are:
Given
-- sample size
--- probability of success
--- half of the participant
Using the binomial probability formula, we have:

For x = 3, the probability is:


