







How can he raise his average to 90? 
20151229 

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. 





My final exam score 
20150619 

From Deirdre: Hi,
I got 69% on a question worth 20%
68% on a question worth 20%
And the final exam was worth 60%
My final grade overall was 63%
Did I do very bad in the exam???? Answered by Penny Nom. 





Possible soccer scores 
20121009 

From Riaan: Good day, I would like to know all the possible scores for a set of 5 soccer matches with no more than 5 total goals being scored in any match.
Bearing in mind that there are three outcomes to every match. Win, Lose or Draw.
Could you please help me with this?
Kind regards
Riaan
South Africa Answered by Penny Nom. 





A normal distribution problem 
20101202 

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. 





t scores, z scores, standard scores and percentile ranks 
20101125 

From Imogen: I have an assignment that requires me to calculate the t scores, z scores, standard scores and percentile ranks of 3 children on a vocab task. I am struggling with how to calculate the correct Tscores for the children, my tutor has said that the sample has a mean of 50 and standard deviation of 10. So on a z score of 2.0 (2 SD's from the mean) it would be 50 + 10+10 = T score of 70. However the Z scores i have are not whole numbers so I am struggling with it, i have one that is 1.27 , another that is 0.47 and the last one is 0.80. If you could help me on how to calculate these to get T scores that would be great. Thanks. Answered by Robert Dawson. 





The callaway system 
20090426 

From Earl: Do you have a formula to enter players scores using the callaway system that calculate each player score after their score is entered? Answered by Victoria West. 





Zscore 
20090325 

From Barb: I am having trouble finding information on a z score and the conversion to the number of standard deviations a z value can be away from the mean.
What exactly does that mean and what am I looking for?
Help Please. Answered by Harley Weston. 





Finding the Raw Score for a Mean of 0 and Standard Deviation of 1 
20081002 

From Anita: A variable Y has a distribution of mean of Y =80 and standard deviation of Y=36. Find the values of A and B for transforming y*=A +BY so that mean of y* =0 and standard deviation of y*=1. Answered by Janice Cotcher. 





zscore 
20080723 

From Sophia: Indicate whether the factor influences the numerator or denominator of the zscore and determine whether the effect would be to increase the value of z(farther from zero) or decrease the value of z(closer to zero).
a. increase trhe sample size
b. increase the population standard deviation
c. increase the difference between the sample mean and the value of µ specified in the null hypothesis Answered by Janice Cotcher. 





zscore 
20080702 

From Candace: If a normalshaped distribution has a mean of 80 and a standard deviation of 15 what is the zscore for M=84 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution? Answered by Harley Weston. 





Average Yearly Percentage Change 
20080110 

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. 





A weighted score 
20070605 

From Cindy: We need to weight numbers differently in terms of a percentage calculation. One number {80 for example} at 65% and another number {100 for example} at 35%. How do we calculate these into one total grade for example. Answered by Penny Nom. 





Find her score 
20070501 

From shelley: barb had 16 right answers and 5 wrong answers in the math competition. Find her score
Jason had 27 right answers and 4 wrong answers in the math competition. find his score Answered by Penny Nom. 





On which assignment did I do better 
20020517 

From Denise: I have 2 writing assignments in class. The first assignment, which had a mean of 10 and a standard deviation of 2, I got a score of 12. The second assignment had a mean of 18 and an s.d. of 3, I got a 21. I need to know which assignment did I do better, relative to my classmates? Answered by Andrei Volodin. 





Normal distribution 
20020121 

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. 





Two gross minus two score 
20000420 

From Georgie: What is two gross minus two score? Answered by Chris Fisher. 

