Find the mean, media, mode, range, and iqr of 13,18,19,17,10,19,18,20,15

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 10.5, q1 at 11.5, median at 12.5, q3 at 13.5, max at 15

Use set builder notation to represent the following set: { -3, -2, -1, 0}

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.