Use the dataset diamonds and the tapply() function to obtain: data(diamonds) (a) The mean carat of diamonds in each of the four levels in variable cut. (b) The median depth of diamonds in each of the eight levels in variable color. (c) The frequency of the diamonds in each color. (d) The frequency of the diamonds in each clarity. (e) The mean price of diamonds in each combination of cut, color, and clarity. (f) The frequency of the diamonds