Sandy has a square, equilateral triangle, rhombus, and regular hexagon in her Shape Bucket, while Robert has a scalene triangle, kite, isosceles trapezoid, non-special quadrilateral, and obtuse isosceles triangle in his. Sandy will randomly select a shape from her Shape Bucket, while Robert will randomly select a shape from his.  

1. Who has a greater probability of selecting a quadrilateral? Justify your conclusion.

   Answer (a):

   Sandy’s probability is $\frac{2}{4}$, while Robert’s is $\frac{3}{5}$, which means that Robert has a greater probability. 

2. Who has a greater probability of selecting an equilateral shape? Justify your conclusion.

3. What is more likely to happen: Sandy selecting a shape with at least two sides that are parallel or Robert selecting a shape with at least two sides that are equal?