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【简答题】
某工地进了一批配制水泥混凝土的砂样,现取样 500g进行筛分试验,筛分结果如下表,试计算: ( 1)分计筛余百分率、累计筛余百分率和通过百分率(准确到1%)。 ( 2)计算细度模数,评价其粗细程度(准确到两位小数)。 筛孔尺寸(mm) 4.75 2.36 1.18 0.6 0.3 0.15 筛底 存留量(g) 30 50 80 130 110 80 20
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相关题目：
【判断题】方差和标准差都是以均值为中心的、反映部分数据的离散程度的特征值,在多方面都优于极差。
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