Posted by **Shelby** on Monday, June 20, 2011 at 5:45pm.

Okay, I'm having trouble understanding the difference between "and" and "or" in problems.

For example:

-When drawing a single card, find the probability of getting a 4 OR a diamond.

-When drawing a single card, find the probability of getting a jack AND a black card.

What is the difference? What are the answers to these so I can check my study guide? Please help, I have a test soon!

- statistics -
**Ms. Sue**, Monday, June 20, 2011 at 5:48pm
When the problem states OR -- then you need to figure two different probabilities.

You have a 1 in 13 chance of drawing a 4. You have a 1 in 4 chance of drawing a diamond.

- statistics -
**PsyDAG**, Tuesday, June 21, 2011 at 11:03am
For either-or probabilities, you add the individual probabilities. 4/52 + 13/52 - 1/52 = ?

Subtract the 1/52, because one of the fours is a diamond.

There are two black jacks in the deck. 2/52 = 1/26

To determine probabilities of all events occurring, multiply the individual probabilities.

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