3. Each of the 500 people in a random sample of the 4,000 students who attend a local community college were asked to name the methods they often use to get to school from home. Al 500 people answered
the estion. The answers were talied, and the percentages of people who walk, drive, ride a bike, and
take bus are shown in the diagram below
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Because this was a random sample, the percentages in the sample are most likely the estimates for the
corresponding percentages among all the students in the school. What estimate does this give for the
number of people who commonly get to school only by bus?