Ex=μ,符合正态分布这一个条件就可以得出平均值为3000
符合标准的正态分布,且C最大,中值就是该分布的期望,也就是平均数,3000
晕又变2500了,那就是2500,你看正态分布的函数图形就知道啦,左右对称
SUMIFS(数字列:数字列,数字列,"<=1000")/a
sumifs(数字列:数字列,数字列,">1000",数字列,"<=2000")/b
sumifs(数字列:数字列,数字列,">2000",数字列,"<=4000")/c
sumifs(数字列:数字列,数字列,">4000",数字列,"<=8000")/d
或者求a,b,c,d用a=countifs(数字列:数字列,"<=1000")
b=countifs(数字列:数字列,">1000",数字列:数字列,"<=2000")
c=countifs(数字列:数字列,">2000",数字列:数字列,"<=4000")
d=countifs(数字列:数字列,">4000",数字列:数字列,"<=8000")
可以用N吗?