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Question regarding math destroyer

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baywatch123

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I wanted to know if the empirical rule (68% - 95% - 99.7%) for figuring out SDs is important for the REAL DAT. Because I find that those keep popping up generously here and there in the math destroyer tests.

I just want to gauge at what i need to focus on and if this isn't important then i won't bother studying it (though i do understand its use)

thanks
 
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