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# Stats class

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# Free bibliography & reference

1. The first exam grades of last semesters Stats class had a mean of 67 with a standard deviation of 5 points. Answer the following questions: a. Jenny received a score of 80. What is her z-score? Is it positive or negative? Why? b.    Michaels z-score was a -1.5. Did he do better or worse than the average? How can you tell? And by how many points? c. Annes z-score was a 0. What does this tell you about her score in relation to the mean? d. John received a score of 65. What is his z-score? Is it positive or negative? Why?For the students in the first part of this question (Jenny, Michael, Anne, and John): e. Which (if any) students fall into the middle 68% of the distribution? f. Which (if any) students fall outside of the middle 68% of the distribution? g. Which (if any) students fall into the top 5% of the distribution? a. h. Which (if any) students fall into the bottom 5% of the distribution?a. Z score = (80-67)/5 = 2.60. As Jennys score is more than the mean so the Z score is positive. b. Michaels Z score is negative so he did worse than the average. The difference of points…

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