Every fifth driver that passes through a toll booth is asked whether they will be going
north or south on the connecting road.
Which type of sampling method is being used?
A. Stratified random sampling
B. Systematic sampling
C. Voluntary response sampling
D. Simple random sampling

Systematic sampling is where you basically just set a rule on how to select each person. In this case, the rule would be to select every 5th person that drives through the toll.

Extra info:

Stratified random sampling is the idea of breaking people into different mutually exclusive homogenous groups (called strata). An example would be to have a group of all boys and another group of all girls.

Voluntary response sampling is exactly what it sounds like: it's whenever you have people who volunteer their responses. In other words, only those who choose to be in the sample will counted. This is more than often a very biased form of sampling.

Simple random sampling (SRS) would involve things like using a random number generator, picking names out of a hat, rolling a dice, etc etc.

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.