(Solved): Several years ago, the state of California launched an aggressive advertisement campaign against sm ...

Several years ago, the state of California launched an aggressive advertisement campaign against smoking. We're interested in the usefulness of this campaign among college students. We've interviewed students from 48 college campuses in California and recorded for each campus the percentage of students who claimed that they had encountered at least one anti-smoking advertisement on campus in the past month. Our results are displayed in the following bistogram. Based on this histogram, estimate the standard deviation of the sample of 48 percentages. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place. (If necessary, consult a list of formulas.)