Ans: C
The new variance
The new variance
$\begin{array}{cl}
= & 4^2 \times 49 \\
= & 784
\end{array}$
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
$\begin{array}{cl}
= & 4^2 \times 49 \\
= & 784
\end{array}$
