http://jingyan.baidu.com/article/624e7459a742e734e8ba5adc.html
http://jingyan.baidu.com/article/ad310e80acac951849f49e92.html
FREQUENCY function [can statistic interval]
countif function [statistic number]
http://jingyan.baidu.com/article/624e7459a742e734e8ba5adc.html
http://jingyan.baidu.com/article/ad310e80acac951849f49e92.html
FREQUENCY function [can statistic interval]
countif function [statistic number]