1.什么是异常值偏离观测值较大的值。?mtcarsmydata<-mtcars#删除第8,9列mydata1<-mydata[,-c(8,9)]mydata1运行结果：>#删除第8,9列>mydata1<-mydata[,-c(8,9)]>mydata1mpgcyldisphpdratwtqsecgearcarbMazdaRX4