Import the data set klausurumfrage.csv into R and save the data in a separate data object. use R

$($ii$)$ Now create a frequency table for the variable note. Use the following syntax:

table$($note$)$

What happens if you enter the following command instead?

prop.table$($table$($note$))$

$($iii$)$ Now calculate the deciles of the variable note. Use the quantile$()-$command.

$($iv$)$ Now create a new variable noteBWL, which contains the grades of the business students:

noteBWL note$[$subject $==0]$

Generate the variable noteVWL in the same way.