Four clearly different and visually distinct datasets produce the same summary statistics. Check out the Datasaurus Dozen. While different in appearance, each dataset has the same summary statistics (mean, standard deviation, and Pearson's correlation) to two decimal places.
Consultation has begun on the draft school-based assessment components and weightings for the current Stage 6 Mathematics, Mathematics Extension 1 and Mathematics Extension 2 courses. Closing date: Sunday 4 June 2017