Question

Your class took a test in statistics and the students earned the following scores:
77 64 86 97

105 85 86 61 77 85 96 86 84 73

1. Find the mean and the standard deviation

2. Find the z score for a grade of 86

Is this an unusual score? why or why not?

3. Find P20, P60, and Q1

You earned a 73, what percentile does this represent?

Your friend is in a different section of statistics. She also took the test and the class mean was 70 with a standard deviation of 2.3 points. Your friend also scored a 73. Relatively speaking, who performed better on the test, you or your friend?

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