a) what proportion of children 10 to 15 years of age have total cholesterol between 180-190?

b) what proportion of children 10 to 15 years of age would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol level over 200)?

c) what is the 90th percentile of total cholesterol?

Ok, so that is the question.

I understand that there are 6 study persons..10,11,12,13,14,& 15 year old's. I plugged in the mean given and the standard deviation that was given...what I don't understand is how do I get the other information...I got the cholesterol information from the first question but am not sure if it correct. If anybody is able to help me with this problem I would greatly appreciate it. I took this class as a filler, it isn't need for my master's degree but I am not able to drop it at this time.

x Cholesterol Mean standard deviation probability

10 180 191 22.4 11

11 185 191 22.4 6

12 190 191 22.4 1

13 195 191 22.4 -4

14 200 191 22.4 -9

15 200+ 191 22.4 not sure what this number would be or if the other numbers are correct.