Using it's concept, it is found that the probability of selecting a boy or a blond-haired person is of 0.7407 = 74.07%.
What is a probability?
A probability is given by the number of desired outcomes divided by the number of total outcomes.
In this problem, we have that there are 27 people, of which 5 + 15 = 20 have at least one of the desired characteristics, hence the probability is given by:
p = 20/27 = 0.7407.
More can be learned about probabilities at https://brainly.com/question/14398287
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