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A batch of parts contains 50 parts from a local supplier of tubing and 20 parts from a supplier of tubing in the next state.

A batch of parts contains 50 parts from a local supplier of tubing and 20 parts from a supplier of tubing in the next state. If four parts are selected randomly , what is the probability they are all from the local supplier? Also find the variation in the number of parts in a sample selected.

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