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【单选题】
87～89 某企业利用直方图对某零件外径尺寸进行控制。质检人员抽检了100个样本，绘制了频数分布表。表中显示，频数最多的组的中心值a一28，组距h=3，经计算∑f，u.-8，∑f.u.-300.（式中：f.表示第i组的频数m表示第i组的代表值） 根据上述资料，回答下列问题： 第 87 题 分布的标准偏差s为（ ）。A.
5.08
B.
5.10
C.
5.19
D.
5.24
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