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May 25, 2015

Homework Help: math

Posted by Patty on Sunday, January 31, 2010 at 12:46pm.

Students were given an exam with 300 multiple-choice questions. The distribution of the scores was normal and mean was 195 with a standard deviation of 30. You may find it helpful to draw out this distribution before answering the questions below

What were the scores of the students who were within one standard deviation of the mean?

What percent of students did that include?

What was the score of students who scored in the middle of the class? (50% did better, 50% did worse).

If Aís are given to students who score 90% or above, what is the minimum Z-score of someone getting an A?

Letís say you got 235 on this test. Your colleague is in a different section of this course. Her score was 82 out of 100 on her test. In her section the mean was 72 and the standard deviation was 7. Which one of you did better? (Hint: compare Z-scores.)

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