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Probability  Problem 2
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
I bet you money when you are doing your home work about probability there’s going to be something about rolling a dice, sometimes they call it a number cube. The important thing to keep in mind is that all 6 spaces are equally likely to be rolled. That’s where I can use my probability formula where I’m going to put number of successful outcomes on top of number of possible outcomes.
So here what’s the probability of rolling a dice and getting an even number? Okay so think about the faces of a dice our options are 1 2 3 4 5 and 6. The even numbers there are 2 4 or 6 right? We don’t care exactly what those numbers are, we just care that they are three of them. There are three successful outcomes out of 6 possible sides on that dice. I’m going to write p of even that means probability of rolling an even number is 3/6.
Reduce that fraction to ½ or you could turn into a decimal or even the percent. It’s totally up to you how you want to write your answer just make sure you are reading directions carefully incase your textbook or your teacher wants a specific format.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (3)
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Probability
Problem 1 6,024 viewsWhat's the probability of pulling an ace out of a deck of cards on your firs try? (Ignore jokers)

Probability
Problem 2 4,793 viewsWhat's the probability of rolling a die and getting an even number?

Probability
Problem 3 4,616 viewsA sock drawer has 4 pairs of white socks, 3 pairs of tan socks, and 3 pairs of black socks. If you pull one pair, what's the probability that it will be white?
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