Professor Blockhus gives two different statistics tests, but one test is harder than the other. Scores...
Professor Blockhus gives two different statistics tests, but one test is harder than the other. Scores on test A are normally distributed with a mean score of 78 and a standard deviation of 6. Scores on test B are also normally distributed but with a mean score of 65 and a standard deviation of 9.
If Erik scored an 79 on test B, what percent of the class scored below him? That is, what is his percentile on test B.
Homework Answers
z score for Erik score in test B = (79 - 65)/9 = 1.56
Hence,
Percent of class scores below him
= P(z < 1.56)
= 0.94
= 94%
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