Do You Return Your Questionnaires? A public opinion research firm claims that approximately 70% of those sent questionnaires respond by returning the questionnaire. Twenty such questionnaires are sent out, and assume that the president’s claim is correct.
a. What is the probability that exactly 10 of the questionnaires are filled out and returned?
b. What is the probability that at least 12 of the questionnaires are filled out and returned?
c. What is the probability that at most 10 of the questionnaires are filled out and returned?
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