Answer
$p(x\leq 92)=.1587$
Work Step by Step
$z_0=\frac{x-\mu}{\sigma}=\frac{92-100}{8}=-1$
According to table IV, page 773:
$p(0\lt z\lt 1)=.3413$
$p(x\leq 92)=p(z\leq -1)=p(z\gt1)=p(z\gt0)-p(z\gt1)=.5-.3413=.1587$
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