  Math Central - mathcentral.uregina.ca  Quandaries & Queries    Q & Q    Topic: test scores   start over

4 items are filed under this topic.    Page1/1            How can he raise his average to 90? 2015-12-29 From Raj:Harris has an 87 in a class where daily works count 20%, quizzes count 20% and tests count 60%. If there are only two test scores what must the score on his second test to raise his average to 90?Answered by Penny Nom.     A normal distribution problem 2010-12-02 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.     Average Yearly Percentage Change 2008-01-10 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.     Normal distribution 2002-01-21 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.      Page1/1    Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.    about math central :: site map :: links :: notre site français