How can I use this information to discourage people using only the average to make decisions?

Each of the three samples ($0; 0; 14; 14$), ($0; 6; 8; 14$), and ($6; 6; 8; 8$) has a mean of $7$. Their standard deviations are $8.08$; $5.77$ and $1.15$ respectively.

Each of the three samples ($0; 0; 14; 14$), ($0; 6; 8; 14$), and ($6; 6; 8; 8$) has a mean of $7$. Their standard deviations are $8.08$; $5.77$ and $1.15$ respectively.