Smartphone adoption among American younger adults has increased substantially and mobile access to the Internet is pervasive. Seventeen percent of young adults, ages 18–29, who own a smartphone are “smartphone-dependent,” meaning that they do not have home broadband service and have limited options for going online other than their mobile device.

Source: Data extracted from www.pewinternet.org/fact-sheet/mobile/.

If a sample of 10 American young adults is selected, what is the probability that

a. 3 are smartphone-dependent?

b. At least 3 are smartphone-dependent?

c. At most 6 are smartphone-dependent?

d. If you selected the sample in a particular geographical area and found that none of the 10 respondents are smartphone-dependent, what conclusions might you reach about whether the percentage of smartphone-dependent young adults in this area was 17%?