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【单选题】
假设已知某地所有18岁正常成年男性的平均收缩压为115.0mmHg,标准差为10.5mmHg。研究者甲从该地随机抽取25名18岁正常成年男性，测得其平均收缩压为119.0mmHg，标准差为11.2mmHg。此外，研究者该地又随机抽取25名8岁正常男孩.测得其平均收缩压为90.0mmHg，标准差为9.5mmHg。 研究者甲抽样25名18岁正常成年男性平均收缩压的标准差是
A.
11.2mmHg
B.
9.5mmHg
C.
10.5mmHg
D.
2.1mmHg
E.
2. 6mmHg
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