Question: Which type of statistic descriptive inferential is each of the

Which type of statistic (descriptive, inferential) is each of the following?
a. Estimating the default rate on all U.S. mortgages from a random sample of 500 loans.
b. Reporting the percent of students in your statistics class who use Verizon.
c. Using a sample of 50 iPhones to predict the average battery life in typical usage.

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