Using the binomial formulas, for example,
\begin{equation*}
P( X = 16 ) = \binom{50}{16} 0.3^{16} \cdot 0.7^{34} \approx 0.11470
\end{equation*}
Using the normal distribution,
\begin{align*}
P( X = 16 ) & = P( 15.5 \lt X \lt 16.5) \\
& \approx normalcdf(15.5,16.5,15,sqrt(10.5)) \\
& = 0.11697
\end{align*}
Notice that these are very close.