SOLUTION: Three different classes take the FCS 140 final. In the first class, the average grade is 90 with a standard deviation of 0.00. You were in the class - what was your grade on the fi

Algebra ->  Probability-and-statistics -> SOLUTION: Three different classes take the FCS 140 final. In the first class, the average grade is 90 with a standard deviation of 0.00. You were in the class - what was your grade on the fi      Log On


   

Question 152042: Three different classes take the FCS 140 final. In the first class, the average grade is 90 with a standard deviation of 0.00. You were in the class - what was your grade on the final?
Second, the other two classes had averages of 91 and 85, and standard deviations for those two classes were 3 and 20 respectively. So one class had an average score of 91 with a standard deviation of 3, and the other an average of 85 and a SD of 20. What can you tell me about those classes based on these numbers?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
An sd of 0 means there is no 'spread' around the mean, So everyone got the same grade
The class with 91 and a small s, tells us the the grades are spread normally and tightly around a mean of 91. So the class did well and everyone got a great grade.
The class with an 85 mean and an sd of 20 tells us the grades are widely spread. Some students did really well; others did not.