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I was trying to do the probability numbers on this equation

The number of employees in the drug testing pool is 25k.

So if 25% of the 25k employees, must be drug tested every year. Spread out over each quarter of the year. That is a total of 6,250 employees divided into 4 quarters. 1,562 employees would be selected each quarter.

Then you must test 10% of the same 25k employees for alcohol. That is 2,500 more employees selected. Over 4 quarters that is 625 more employees selected.

What is the probability of one employee being selected for both alcohol & drug test in the same quarter? Or how often could this type of event occur?

The number of employees in the drug testing pool is 25k.

So if 25% of the 25k employees, must be drug tested every year. Spread out over each quarter of the year. That is a total of 6,250 employees divided into 4 quarters. 1,562 employees would be selected each quarter.

Then you must test 10% of the same 25k employees for alcohol. That is 2,500 more employees selected. Over 4 quarters that is 625 more employees selected.

What is the probability of one employee being selected for both alcohol & drug test in the same quarter? Or how often could this type of event occur?

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