Sir Ronald Aylmer Fisher was an English statistician, evolutionary biologist, and geneticist who worked on a data set that contained sepal length and width (in millimeters), and petal length and width (in millimeters) from three species of iris flowers (setosa, versicolor and virginica). There were 57 flowers from each species in the data set. . The first six rows of the data set are shown below: Sepal Length Sepal Width Petal Length Petal Width Species
5.3 3.7 1.5 0.2 Setosa
6.4 2.9 4.3 1.3 Versicolor
4.9 3 1.4 0.2 Setosa
5.8 2.7 5.1 1.9 Virginica
7.2 3.6 6.1 2.5 Virginica
6.7 3.3 5.7 2.1 Virginica

1. How many cases were included in the data?
2. How many numerical variables are included in the data?
3. The numerical variables are:

a. all continuous
b. a mixture of continuous and discrete
c. all discrete