Z-score question involving LSAT scores

MarkFL said:
Okay, then you would subtract half the given area from 0.5 if you want to use the lower bound.
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And the given area in this case is 0.20, so we'd take away 0.10 from 0.5? Sorry if this is annoying.
 
The given area between 145 to 155 is 40%. So if you wanted to use the lower bound of 145 you'd subtract 0.2 from 0.5 to get 0.3.
 
You see, 30% is to the left of 145, 40% is between 145 and 155 and 30% is to the right of 155.
 
I must admit that I did not read all the posts but to assume the intervals given are both centered around the mean......well that just is not a reasonable assumption to ever make. It may work with the given numbers but just can't be assumed (as Dr Peterson already said).

To the OP: Did you post the exact problem as it appears in your book?
 
Given that the OP stated the mean of 150 was correct, I felt the given intervals must indeed be centered on the mean, or at least this was the intention of the problem's author, although I do agree this problem was constructed sloppily.
 
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