Given a square, how much it covers a plane is given by its area. Area of a square depends on the length of the square's side. The bigger the length, the bigger the area. A small square has a smaller length of its side than a medium square, and a medium square has a smaller length of its side than a large square. So, a smaller square has a smaller area than a medium square, and a medium square has a smaller area than a large square. In conclusion, a large square covers more area than a medium and a smaller square.
About 95% of a normal distribution lies within two standard deviations of the mean, so 5% lies without, and since the distribution is symmetric, 2.5% lies to either side. This means
