9.ABD【解析】甲同学的体温的极差为36.6一36.1=0.5℃,故A选项正确;甲同学的体温从低到高依次为36.1℃,36.1℃,36.3℃,36.3℃,36.3℃,36.5℃,36.6℃,故众数为36.3℃,故B选项正确;乙同学的体温从低到高依次为36.2℃,36.3℃,36.3℃,36.4℃,36.5℃,36.5℃,36.6℃,故中位数为36.4℃,而平均数也是36.4℃,故C选项错误;从折线图上可以看出,乙同学的体温比甲同学的体温稳定,故D选项正确.
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