Answer:
Cluster Sampling
Step-by-step explanation:
In cluster sampling, the population is divided into several categories and random sampling is applied to the selected clusters.
This method is used when the population is not homogeneous and therefore has to be divided into several clusters.
This sampling method is prone to <em>sampling error</em> because it leaves some clusters out. On the other hand it is <em>easier</em> to implement.
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Answer:
7x - 7
Step-by-step explanation:
Product of x and 7 = 7x
7 minus 7x
7x - 7
Hence the expression is :
7x - 7
