To determine customer opinion of their pricing, greyhound lines randomly selects 90 busses during a certain week and surveys all passengers on the busses. what type of sampling is used?

Cluster sampling.

Step-by-step explanation:

In the given situation Greyhound Lines randomly selects 90 buses during a certain week and surveys all passengers on the buses.

Here, week= Cluster

Buses = Elements

Therefore , the type of sampling is used = Cluster sampling.

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step-by-step explanation:

$12. that is my answer.