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3 items are filed under this topic.
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A normal distribution problem |
2010-12-02 |
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From Racquel:
I am stuck on this question. I am not sure if using the z score will help
me get the answer I need. Here is the question?
The average length of time per week that students at this university spend
on homework is normally distributed with a mean of 18 hours and a standard
deviation of 3 hours. If Diane spends more time on homework each week than
75% of students, what is the minimum time she must spend?
Answered by Penny Nom. |
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Average Yearly Percentage Change |
2008-01-10 |
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From Ray:
It's about average test scores over a three year span. If the scores were:
2005- 52.6%
2006- 42.5%
2007- 45.5%
What is the average amount they changed each year in three years?
Answered by Stephen La Rocque and Harley Weston. |
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Normal distribution |
2002-01-21 |
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From Danielle:
A teacher gave a test on which the students' marks were normally distributed, but the results were pathetic. The mean was 52% and the standart deviation was 12%. The teacher decided that the top 10% of the students should get A's, the next 20% should get B's, the next 40% should get C's, the next 20% should get D's, and the bottom 10% should get F's. To the nearest percent, what are the cutoff marks that will result in an A, B, C, D, and F?
Answered by Penny Nom. |
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