<PRE><B>Question 1169226</B>
z=(x-mean)/sd
a is -3 sd s from the mean -165/55
That is about 0.0015 or 0.15%
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b is -2 sd s from the mean, and that is 2.28%; use 2.5% for approximate
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c. this is between -1 and +1 sd s and is about 68%.
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d is between 0 and 1 sd and is half that or 34%
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e is between -2 sd s and 0 sd s or about 47.5%
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f. this is between 0 and +3 sd s and is about 49.85%</PRE>