Question

Sally estimated that her call would take 21 minutes but it actually took 15 minutes. What was her percent of error?

a] 21%
b] 28.6%
c] 33.3%
d]40%

2] Casey performs a survey to determine what students think about the sale offers in her store. Which is an unbiased representative sample of the population?

a] every tenth customer that does not buy something

b] the first 30 customers that do buy something

c] every twentieth customer that enters the store

d] the first 30 customers that buy something