In what specific type of a sampling technique every 40th member of the 1 point population may particularly be selected?

Identify which variable is continuous.
Eye Color Number of graphing calculators in a class Number of iPads Type of pet The height of a flagpole Number of cars in a dealership showroom
In what specific type of a sampling technique every 40th member of the 1 point population may particularly be selected?
In what type of a symmetrical distribution there are two peaks with 1 point frequencies clustering around two sub-groups?
What type of data are distinct and can be counted?