coreygeorge
New member
- Joined
- Jun 3, 2016
- Messages
- 1
I'm having some trouble with a question on my stats assignment, I went to the free tutoring on campus but the notes they made are a little confusing:
Q: Suppose that you have a grade of 63. What percent of students scored higher than you? Please show the procedures of your calculations
Mean: 70
SD: 6.1
So I assumed the procedure would be:
P (x > 63)
P (z > 63 – 70 / 6.1)
P (z > -1.147)
and the tutor on campus said they answer would be, 86.43% (0.8643 X 100 = 86.43%).
I don't know why but I feel like this is wrong? I don't understand how they made the leap from -1.147 to getting the .8643 from our table
This is the table my prof supplied us with in her notes, I used it because our textbook doesn't have a complete table, only one with selected numbers, which isn't much help (just in case the table won't enlarge here is the link to it: http://www.sfu.ca/personal/archives/richards/Table/Pages/Table1.htm)
Thanks!
Q: Suppose that you have a grade of 63. What percent of students scored higher than you? Please show the procedures of your calculations
Mean: 70
SD: 6.1
So I assumed the procedure would be:
P (x > 63)
P (z > 63 – 70 / 6.1)
P (z > -1.147)
and the tutor on campus said they answer would be, 86.43% (0.8643 X 100 = 86.43%).
I don't know why but I feel like this is wrong? I don't understand how they made the leap from -1.147 to getting the .8643 from our table
This is the table my prof supplied us with in her notes, I used it because our textbook doesn't have a complete table, only one with selected numbers, which isn't much help (just in case the table won't enlarge here is the link to it: http://www.sfu.ca/personal/archives/richards/Table/Pages/Table1.htm)
Thanks!