Question: The R statement data( iris ) loads the built-in R data set iris . This dataset has 150 rows and 5 columns. The 5 column

The R statement data(iris) loads the built-in R data set iris. This dataset has 150 rows and 5 columns. The 5 column names are "Sepal.Length","Sepal.Width","Petal.Length","Petal.Width" and "Species"

Write R code(s) to find the average values of Sepal.Length (the first column) for three species setosa, versicolor, and virginica (the fifth column), respectively. The returned results should be as follows:

setosaver	sicolor	virginica
5.006	5.936	6.588

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