Question
Over the past 30 years of teaching, a statistics professor found that the distribution of final grades of the students (X) is normal with mean
Over the past 30 years of teaching, a statistics professor found that the distribution of final grades of the students (X) is normal with mean = 70 and standard deviation = 10. Using the books notation, this is written as
X N (70,10). Solve the following problems: (Show all solutions and diagrams, 5 points each).
- Find the percentage of students whose scores range from the mean to 85.
- Find the percentage of students scoring between 65 and the mean.
- Find the percentage of students scoring between 74 and 84.
- Find the percentage of students scoring between 62 and 72.
- Find the percentage of students who did (a) very well, scoring above 85, and (b) those students who did poorly, scoring below 50.
- Find the raw score that bounds the top 10 percent of the distribution.
Show work please.
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Personal Financial Planning
Authors: Lawrence J. Gitman, Michael D. Joehnk, Randy Billingsley
13th edition
1111971633, 978-1111971632
