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如图是根据50个城市某年6月份的平均气温(单位:℃)数据得到的样本频率分布直方图...
如图是根据50个城市某年6月份的平均气温(单位:℃)数据得到的样本频率分布直方图,其中平均气温的范围是[20.5,26.5],样本数据的分组为[20.5,21.5),[21.5,22.5),[22.5,23.5),[23.5,24.5),[25.5,26.5],由图中数据可知a=
;样本中平均气温不低于23.5℃的城市个数为
.
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