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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,2018/5/27 Sunday,#,20.2,数据的波动程度,第,1,课时,宁乡市实验中学 刘念,哪个城市的气温变化大?,波动程度小,波动程度大,、天安门国旗护卫队要有整齐的队伍,、体育教练想要体育成绩稳定的选手参加县运动会,身高数据的波动程度小,成绩数据的波动程度小,如何确定一组数据的波动程度呢?,A,组:,7,,,3,,,7,,,3,,,7,,,3 B,组:,6,,,4,,,6,,,4,,,6,,,4,A,组:,51,,,78,,,55,,,18,,,22,,,28,,,47,,,90,,,135,,,164,,,194,,,109,,,33,,,113,,,130,,,178,,,44,,,133,,,41,,,56,B,组:,132,,,124,,,120,,,41,,,33,,,58,,,56,,,136,,,31,,,41,,,23,,,30,,,36,,,56,,,124,,,137,,,139,,,139,,,103,,,129,方差,方差,=,-,x),2,+,-,x),2,+,-,x),2,看个例子,在一次芭蕾舞比赛中,甲、乙两个芭蕾舞团都表演了舞剧,天鹅湖,,参加表演的女演员的身高(单位:,cm,)如下表所示。,哪个芭蕾舞团女演员的身高更整齐?,甲,163,164,164,165,165,166,166,167,乙,163,165,165,166,166,167,168,168,益阳市,2017,年中考题,18,题(,10,分),
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