# Stat Help

**URL:** <https://boards.straightdope.com/t/stat-help/149246>\
**Category:** Factual Questions\
**Created:** [January 17, 2003, 4:31pm UTC](https://boards.straightdope.com/t/stat-help/149246 "2003-01-17T16:31:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SoulSearching](https://avatars.discourse-cdn.com/v4/letter/s/848f3c/32.png) [@SoulSearching](https://boards.straightdope.com/u/SoulSearching)\
**Post date:** [January 17, 2003, 4:31pm UTC](https://boards.straightdope.com/t/stat-help/149246/1 "2003-01-17T16:31:07Z")

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I can’t seem to figure out this problem.  
mean=110 std=25 (iq scores for men 20-34)  
What iq scores fall in thee lowest 25% of the distribution?  
I know I am solving for x in the equation: x=mean+z(std)

So I must need the z score and looking at the table is confusing because 25% gives a z score of -.67 but that doesn’t make sense (gives iq score of 93.25). The z score NEEDS to be -1.6 so that the equation can give an answer of 70 (iq score). -1.6 has a % of of .0548 thoug…WHAT???  
I feel stupid for asking, but I also think spending hours to figure it out myself is quite stupid too since I could spend that time more wisely.  
Thanks guys…