P'P'PF' What licommandlsl would you use to remove null values rrom a dataset: What R function is used to encode a vector as a category? What is a rug plot used for in a density plot? An online retailer wants to study the purchase behaviors of its customers. Figure below shm the density plot of the purchase sizes {in dollars}. What would be your recommendation to enhance the plot to detect more structures that otherwise might be missed? EH\" Ell-l" E\