Descriptive Statistics

Implement the summary statistics an analyst reaches for first, from their definitions. percentiles returns chosen percentiles of a sample (linear interpolation), iqr the interquartile range, zscores standardises a sample to mean 0 and standard deviation 1, pearson is the Pearson correlation of two samples computed from its formula (without calling np.corrcoef), and covariance_matrix is the sample covariance matrix of the columns of a 2D array (without calling np.cov).