Section 5-4
Directions for question #7
Finding u,o, and Unusual Values – Assume that a procedure yields a binominal distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean u and standard deviation o. Also, use the range rule of thumb to find the minimum usual value u – 2o and the maximum usual value u + 2o.
# 7 n=1492, p=1/4
#10 Guessing Answers: Several economics students are unprepared for a multiple-choice quiz with 25 question, and all of their answers are guesses. Each question has five possible answers, and only one of them is correct.
A – Find the mean and standard deviation for the number of correct answers for such students.
B – Would it be unusual for a student to pass by guessing and getting at least 15 correct answers? Why or why not?
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