某混凝土设计强度等级为C30,前期无足够的统计资料。现抽取10组试件组成一验收批。试按标准差未知的统计方案验收该批混凝土是否合格?38.9MPa,40.3MPa,35.2MPa,38.4MPa,43.1MPa,38.2MPa,36.9MPa,39.3MPa,37.4MPa,36.6MPa。
出自:理学