Question

The weight Y (in grams, denoted as g) of a pack of coffee is normally distributed with mean 250 g and variance 4 g^2.

Calculate P(248 11 years ago

Answer 1

You and me both. Sorry.

Answer 2

\[\begin{align*}
P(248<Y<252)&=P\left(\frac{248-250}{4}<\frac{Y-250}{4}<\frac{252-250}{4}\right)\\\\
&=P(-0.5<Z<0.5)\\\\
&=2P(0<Z<0.5)
\end{align*}\]