\textbf{142-} The scores of a technical skills test for two workers $A$ and $B$ are as follows:
$A: 15, 14, 15, 16, 17, 19$
$B: 16, 14, 17, 14, 17, 18$
Which worker has greater precision?
(1) $A$ \hfill (2) $B$ \hfill (3) Equal \hfill (4) Unpredictable
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