Using the 'iris' dataset, answer the following questions:

a$.$ Are the Sepal Length data normal?

b$.$ Is there a correlation between Sepal Length and Petal Width? What is percent correlation?

c$.$ Using ggplot, plot the correlation between Sepal Length and Petal Width. Include a line that displays the linear regression model. Color this line red.

d$.$ What is the R$2$ value associated with this linear regression model? Are these values well correlated $($assume $75\%$ is the threshold$).$