Answer
$285$ women had babies in good or excellent health.
Work Step by Step
Typical percentage problem:
What percent ($n$, as a decimal number) of (the base amount $y)$ is $x?$
Translated:$\quad n\cdot y=x$
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Here, reworded, $\quad 95\%$ of ($y=300$) is ($x=?$).
Translated:$\quad 0.95\cdot 300=x$
($ 95\%$ converted to decimal notation is $0.95)$
$x=285$
