I have taken the test and I can confirm that the answer is
B. 15 m, 20 m, and 25 m.
Have a fantastic day!
Try .2 and see if it works.
Answer:
Given p = 0.07 as the probability that someone is a universal donor
In case of Geometric Distribution, Probability of getting the first success on nth trial is given by

where p is the probability of success on any one trial and (1-p) shows the probability of failure.
So the probability of the first subject to be a universal blood donor will be the seventh person is

So the final probability is 0.0453
Answer:
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