Ball Mixing Activity: 4 Balls in 2 Boxes - 8th grade probability

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Scratch file designed by Linda Fahlberg-Stojanovska.

Activity Notes

We have 4 balls - 2 Reds and 2 Greens. We drop them randomly into 2 boxes.
Are the colors mixed or separate?

These two events are mutually exclusive and complete.

(a) Both boxes will have will have 1R & 1G.
We call this event: MIXED colors.

(b) One box 2G, other box 2R.
We call this event: SEPARATE colors.

Guided Activity

Do the experiment 200-1000 times.

• What is the percent of mixed?
• What is the percent of separate?

Now for some dreaded theory ...
Number the balls:

• How many different ways can the balls drop into the boxes?
• How many times does mixed occur?
• Does your theory match your experiment?

"Mutually exclusive" meaning both events cannot happen at same time and "complete" meaning no other event can occur.

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(:commentbox:)

Thank-you.

Dani  —  10 September 2008, 08:47

This is really very useful program.

I will share it with others.

--Dani

Page last modified on September 27, 2008, at 03:12 PM