The following is a list of GPA ranges and frequencies from a high school. Use 1.5 as the midpoint of the 2.0 or less category. (See the Excel Data File.)
A) What is the mean GPA?
B) What is the sample standard deviation of the GPA?
C) Assuming the distribution is bell shaped what percentage of the students would have GPAs between 1.5 and 3.9? Does this make sense given what you know about GPAs?

Question

The following is a list of GPA ranges and frequencies from a high school. Use 1.5 as the midpoint of the 2.0 or less category.  (See the Excel Data File.)
A) What is the mean GPA? 
B) What is the sample standard deviation of the GPA? 
C) Assuming the distribution is bell shaped what percentage of the students would have GPAs between 1.5 and 3.9? Does this make sense given what you know about GPAs?

Quizplus · Accepted Answer

The Answer of The following is a list of GPA ranges and frequencies from a high school. Use 1.5 as the midpoint of the 2.0 or less category.  (See the Excel Data File.)
A) What is the mean GPA? 
B) What is the sample standard deviation of the GPA? 
C) Assuming the distribution is bell shaped what percentage of the students would have GPAs between 1.5 and 3.9? Does this make sense given what you know about GPAs?

The Following Is a List of GPA Ranges and Frequencies