In: Statistics and Probability
In a sample of 1100 U.S. adults, 203 think that most celebrities are good role models. Two Two U.S. adults are selected at random from the population of all U.S. adults without replacement. Assuming the sample is representative of all U.S. adults, complete parts (a) through (c).
(a) Find the probability that both adults think most celebrities are good role models. The probability that both adults think most celebrities are good role models is ________?(Round to three decimal places as needed.)
(b) Find the probability that neither adult thinks most celebrities are good role models. The probability that neither adult thinks most celebrities are good role models is _______?(Round to three decimal places as needed.)
(c) Find the probability that at least one of the two adults thinks most celebrities are good role models. The probability that at least one of the two adults thinks most celebrities are good role models ______? (Round to three decimal places as needed.)
Given,
In a sample of 1100 U.S. adults, 203 adult people think that most celebrities are good role models
Therefore,
Probability that a U.S. adult person think that most celebrities are good role models, p = 203/1100
Probability that a U.S. adult person does not think that most celebrities are good role models = 1 - p = 1 – (203/1100) = 897/1100
Two U.S. adults are selected at random from the population of all U.S. adults Without Replacement
Answer a:
Probability that both adults think
that celebrities are good role models = p^2 =
(203/1100)^2
= 0.034
Answer b:
Probability that neither adult thinks
that celebrities are good role models = (1 – p)^2 = (897/1100)^2 =
0.665
Answer c:
Probability that at least one of the
two adults thinks most celebrities are good role models = 1 -
Probability that neither adult thinks that celebrities are good
role models = 1 – 0.665 = 0.335
(All answers are rounded up to 3 decimal places)