According to a study done by Nick Wilson of Otago University Wellington, the probability a randomly selected individual will not cover his or her mouth when sneezing is

0.267.

Suppose you sit on a bench in a mall and observe people's habits as they sneeze. Complete parts (a) through (c).

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Part 1

(a) What is the probability that among

18

randomly observed individuals, exactly

7

do not cover their mouth when sneezing?

Using the binomial distribution, the probability is