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Question from Student
I get confused with the normal distribution. How can I tell if I should add or subtract to
get the answer?
Answer from Dr. J.
It depends entirely on what the question is that is being asked.
The best thing that I can suggest is to graph each and every problem out.
This does not take long. Just a simple graph scratched out on paper to help you visually
see things.
Follow these steps, and see the various examples I have given below.
1. Sketch a normal curve.
2. Mark the X values and corresponding Z values under the horizontal axis. The authors
do the same in figure 6.6. Notice how they have X values reported on the X axis (the
36500 and the 40000). Also, note how they have the corresponding Z values reported
under the X values: I am talking about the 0 and 0.7).
3. Partition the area under the curve using vertical lines that go all the way up to the
curve (like the authors do in figures 6.6 and 6.7).
4. Shade the area that corresponds to the answer for the problem. The authors have done
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This note was uploaded on 11/13/2011 for the course MBA 522 taught by Professor Nabavi during the Spring '08 term at Bellevue.
 Spring '08
 Nabavi

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