Find the mean, variance and standard deviation using short cut method :
\begin{tabular}{|l|c|c|c...
Find the mean, variance and standard deviation using short cut method :
\begin{tabular}{|l|c|c|c|c|c|c|c|c|c|}
\hline Height \( ( \) in cm \( ) \) & \( 70-75 \) & \( 75-80 \) & \( 80-85 \) & \( 85-90 \) & \( 90-95 \) & \( 95-100 \) & \( 100-105 \) & \( 105-110 \) & \( 110-115 \) \\
\hline Number of children & 3 & 4 & 7 & 7 & 15 & 9 & 6 & 6 & 3 \\
\hline
\end{tabular}
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