Question 387667
I.{{{z=(x-mu)/sigma}}}
{{{z=(30-15)/sqrt(36)}}}
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III.{{{P(x<30)=P(z)}}} where {{{z}}} was calculated in I.
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II. {{{P(x>30)+P(x<30)=1}}}
{{{P(x>30)=1-P(x<30)}}}
{{{P(x>30)=1-P(z)}}}