Answer:
Systematic sample
Step-by-step explanation:
Sampling is the statistical process by which a small representation (sample) is chosen form a population and results for this sample is used to draw conclusions about the whole population.
There are two types of sampling. The simple random sampling and the systematic sampling.
Systematic sampling is when subjects in a sampl are selected at fixed intervals. For example selecting every tenth customer for review from a sample of 200 customers.