x=c(-20, -15, -5, 8, 12, 9, 2, 23, 19)
sum(x)
## [1] 33
mean(x)
## [1] 3.666667
sum(x)/length(x)
## [1] 3.666667
sum(x[x>0])
## [1] 73
which(x==23)
## [1] 8
sum(x)
## [1] 33
max(x)
## [1] 23
a=c(sum(x) - max(x))
b=c(length(x)-1)
a/b
## [1] 1.25
x[abs(x)>=8&x<8]
## [1] -20 -15
commute=c(23, 18, 29, 22, 24, 27, 19, 28, 23)
mean(commute)
## [1] 23.66667
min(commute)
## [1] 18
max(commute)
## [1] 29
y=c(2, 4, 8)
z=c(1, 5, 2)
2*y
## [1] 4 8 16
y+z
## [1] 3 9 10
y-2
## [1] 0 2 6
x=c(1,8,2,6,3,8,5,5,5,5)
sum(x) / length(x)
## [1] 4.8
x-4
## [1] -3 4 -2 2 -1 4 1 1 1 1
range(x)
## [1] 1 8
max(x)-min(x)
## [1] 7
x2=c(x-mean(x))
sum(x2)
## [1] 1.776357e-15