normal distribution

#1
So I am lost on this one. -- I have a sample that consists of 5 grades - best, better, average, worse, worst. The grades follow a normal distribution. If the sample size is 100, how do i determine the 'quantity' of each grade?
 

vinux

Dark Knight
#2
So I am lost on this one. -- I have a sample that consists of 5 grades - best, better, average, worse, worst. The grades follow a normal distribution. If the sample size is 100, how do i determine the 'quantity' of each grade?
I wonder how do you come up the statement the grades follow a normal distribution. How do you define grade? Is it based on the marks, you place it in 5 buckets of grade?
 
#3
This is an incomplete question. You can say it is normally distributed without sequential evidence. It has no frequency of marks or grade distribution, without such figure n, r, p and/ standard deviation you can't find the solution to it either by calculation or normal distribution table. Thanks. Charls