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Chapter 11, Problem 39AYU(choose chapter or problem)
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.
(a) What is the probability that among 10 randomly observed individuals exactly 4 do not cover their mouth when sneezing?
(b) What is the probability that among 10 randomly observed individuals fewer than 3 do not cover their mouth?
(c) Would you be surprised if, after observing 10 individuals, fewer than half covered their mouth when sneezing? Why?
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QUESTION:
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.
(a) What is the probability that among 10 randomly observed individuals exactly 4 do not cover their mouth when sneezing?
(b) What is the probability that among 10 randomly observed individuals fewer than 3 do not cover their mouth?
(c) Would you be surprised if, after observing 10 individuals, fewer than half covered their mouth when sneezing? Why?
ANSWER:
Step 1 of 4
Given:
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.
a)
Let x be the number of person do not cover their mouth.
Let the probability a randomly selected individual will not cover his or her mouth when sneezing is 0.267.
P = 0.267
Let the sample size n = 10.
Let x follows binomial distribution with parameter np.
Here n = 10 and P = 0.267
The probability of a mass function of a binomial distribution is
P(X = x) = \(n C_{x} p^{x}(1-p)^{n-x}\) , for x = 0, 1, 2, . . . , n
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