From 500 Customers Major Appliance Manufacturer

From 500 customers, a major appliance manufacturer will randomly select a sample without replacement. The company estimates that 25% of the customers will provide useful data. If this estimate is correct, what is the probability mass function of the number of customers that will provide useful data?
(a) Assume that the company samples 5 customers.
(b) Assume that the company samples 10 customers.

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