Questionnaires, continued Refer to Exercise 5.84. If n = 20 questionnaires are sent out,
a. What is the average number of questionnaires that will be returned?
b. What is the standard deviation of the number of questionnaires that will be returned?
c. If x = 10 of the 20 questionnaires are returned to the company, would you consider this to be an unusual response? Explain.
Reference:
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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