The "Boston" data set is a built-in dataset in the "MASS" library of R. The "Boston" data set contains information about the housing values in suburbs of Boston city. First, load the "Boston" data set into your R workspace. In Rstudio, you can click on the "Packages" tab and then on the checkbox next to MASS. Without Rstudio, type the following command in R console: data(Boston,package="MASS") To know more information about this dataset, type the following command in R console: ?Boston Then, answer the following questions based on the dataset, using R/Rstudio: a. How many rows and columns in this data set? b. How many of the suburbs in this dataset bound the Charles River? (Hint: Variable chas is a dummy variable; chas=1 means tract bounds river, 0 otherwise) You can obtain a list of suburbs bound the Charles River with the command: subset(Boston,chas==1) You can obtain a count of the suburbs bound the Charles River by sum(Boston$chas==1) c. What is the probability that you randomly select a suburb that bounds the Charles River?