答案：D
留意該分佈有 $24$ 名工人。則該分佈的下四分位數
$\begin{array}{cl}
= & \dfrac{\text{第 $6$ 個數據} +\text{第 $7$ 個數據}}{2} \\
= & \dfrac{62+62}{2} \\
= & 62 \text{ kg}
\end{array}$
由此，所求的概率
$\begin{array}{cl}
= & \dfrac{20}{24} \\
= & \dfrac{5}{6}
\end{array}$
