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x1 <- c(rep(10,5),rep(25,5),rep(35,6),rep(45,10),rep(55,38) ,rep(65,30) ,rep(75,20),rep(85,4),rep(95,2)); cvp <- function(x) { ni<- table(x); n<-sum(ni);
m1<- mean(x); s1 <-sd(x)*sqrt((n-1)/n); cv<- s1/abs(m1); cv } cvp(x1) [1] 12.52664
x1 := Join[ConstantArray[10, 5], ConstantArray[25, 5], ConstantArray[35, 6], ConstantArray[45, 10], ConstantArray[55, 38] , ConstantArray[65, 30], ConstantArray[75, 20], ConstantArray[85, 4] , ConstantArray[95, 2]]; ni := Tally [x1]; n := Sum[ni[[i, 2]], {i, Length[ni]}]; m1:=Mean[x1] s1:=StandardDeviation[x1] Sqrt[(n - 1)/n]; cv:= (s1/Abs[m1]) N[cv] 0.297009
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