Using it's concept, it is found that the probability that a person chosen at random from this group has brown or green eyes is of
.
<h3>What is a probability?</h3>
A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.
Researching the problem on the internet, it is found that the group has 20 + 6 + 17 + 7 = 50 people, of which 20 + 6 = 26 have brown or green eyes, hence the probability is given by:
p = 26/50 = 13/25.
More can be learned about probabilities at brainly.com/question/14398287
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The waitress gets 45/75 = 3/5 of the tips
so waitress gets 3/5 * 350 = $210
There are no properties because you can do anything with subtraction and division