(Answered) A supplier of ballpoint pens guarantees a low defective

Statistics

A supplier of ballpoint pens guarantees a low defective rate. Sara receives a shipment of 400 pens (and unknown to Sara, but known to you, exactly 12 are defective). Sara decides to randomly check 100 pens. Let X be the number of defectives Sara finds among the 100 randomly selected pens.

How would I find the mean and standard deviation of x?

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