(a) A university wants to investigate student use of its library, so for a week they pay someone to stand outside the library and give a questionnaire to everyone who goes in. What is the problem with this survey?

(b) A college had 35 students studying liberal arts, 10 studying science, 25 in medicine, 45 in business and 20 in other subjects. What was the relative frequency of the medical group? How could you represent this in a diagram?

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