Any large random sample from a group of people will be representative of the entire group.
true
false

False.

In a random sample each member of the group has the same chances to be choosen. A representative sample replicates the characteristcs that you want of the group. Many times you need to make the sampling not random to pick a sample that represents or replicates the group.

(1/x + 1)^2 + 6 (1/x + 1) +5