题目内容
（请给出正确答案）
某烧结普通砖试验，10块砖样的抗压强度值分别为：14.2、21.1、9.5、22.9、13.3、18.8、18.2、18.2、19.8、19.8(单位：MPa)，试确定该砖的强度等级。
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