China Naming Network - Ziwei knowledge - During the Spring Festival of 20 14, the weather in Lanzhou continued to be fine. The monitoring data shows that1From October 30th to February 6th, the air quality in Lanzhou was good, with 65,438+,and the air was polluted.
During the Spring Festival of 20 14, the weather in Lanzhou continued to be fine. The monitoring data shows that1From October 30th to February 6th, the air quality in Lanzhou was good, with 65,438+,and the air was polluted.
This set of data is arranged in descending order: 55, 62, 73, 80, 82, 85, 9 1, 96,
The median is 80+822=8 1,
The average is 55+62+73+80+82+85+91+968 = 78.
So choose D.