> data(iris)
> head(iris)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4 0.2 setosa
3 4.7 3.2 1.3 0.2 setosa
4 4.6 3.1 1.5 0.2 setosa
5 5.0 3.6 1.4 0.2 setosa
6 5.4 3.9 1.7 0.4 setosa
> summary(iris)
Sepal.Length Sepal.Width Petal.Length
Min. :4.300 Min. :2.000 Min. :1.000
1st Qu.:5.100 1st Qu.:2.800 1st Qu.:1.600
Median :5.800 Median :3.000 Median :4.350
Mean :5.843 Mean :3.057 Mean :3.758
3rd Qu.:6.400 3rd Qu.:3.300 3rd Qu.:5.100
Max. :7.900 Max. :4.400 Max. :6.900
Petal.Width Species
Min. :0.100 setosa :50
1st Qu.:0.300 versicolor:50
Median :1.300 virginica :50
Mean :1.199
3rd Qu.:1.800
Max. :2.500
> mean(iris$Petal.Width)
[1] 1.199333
> median(iris$Petal.Width)
[1] 1.3
> sd(iris$Petal.Width)
[1] 0.7622377
> var(iris$Petal.Width)
[1] 0.5810063
> quantile(iris$Petal.Width,1/4)
25%
0.3
> quantile(iris$Petal.Width, 3/4)
75%
1.8
> max(iris$Petal.Width)
[1] 2.5
> min(iris$Petal.Width)
[1] 0.1