Work with the ALL data set in the ALL package.

$($a$)$ Create a frequency table and pie chart for the categories of disease type$/$stage of the

leukemia patients. That is$,$ use the variable: ALL$BT$.$

$($b$)$ Use exprs$($ALL$[,$ALL$BT$=="$B$4"])$ to extract gene expressions for the $12$ patients in

disease stage B$4.$ Create one figure with a box plot for each patient$/$column with

disease stage B$4.$

$($c$)$ Compute the mean for each patient $($column$)$ in disease stage B$4.$ What do you observe