normal distribution z-score mystery

drist

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Joined
Oct 5, 2010
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Hi I have this stat 100 question that I am just not wrapping my head around.
Here it is
Suppose we have a population which is normally distributed with the mean u and standard deviation Q( this symbol should be upside down) .
- use the standard normal tables to find the z-scores of the first and third quartiles and from this find a formula for the interquartile range of the population in terms of u and Q(upside down)

I know how to calculate the second part put cant figure how to give m and Q values so I can find the z score ... any help???

Looking forward to your reply!
 
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