A recent survey states that 48% of mobile devices are iPhones. In order to learn more about
Question:
a. If he surveys 20 people, what is the probability he finds exactly 2 people who use an iPhone?
b. If he surveys 20 people, what is the probability he finds at least 2 people who use an iPhone?
c. If he surveys 20 people, what is the probability he finds fewer than 2 people who use an iPhone?
d. How many students would he have to ask to be at least 90% certain of finding at least one person who uses an iPhone?
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Related Book For
Introduction to Probability
ISBN: 978-0716771098
1st edition
Authors: Mark Daniel Ward, Ellen Gundlach
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