Asteroid densities

You need to establish (from the dataset below) the distribution of asteroid densities, with and without weighting by the measurement errors. (Note that the sample is not random so it will not accurately reflect the true population distribution.) Parametric modelling (mean, variance, kurtosis) and nonparametric density estimation. Look for bimodality (e.g. solid rock vs. ice vs. porous interior). Need graphs, formulas used, diagrams etc. Include: Inroduction, discussion of results, conclusion and references. Dataset: http://astrostatistics.psu.edu/datasets/asteroid_dens.dat