Khan/khan-exercises — Issue #14690: Probability 1 - The video doesn't address the formula required
Author: KhanBugz
Created: 2012-02-26 16:50:53+00:00
State: open
Labels: chrome, hard, snowleo

Several times I've attempted this module and I still haven't gotten it. The problem is that even though the videos say that later we'll address how to get the formula for (say) exactly 2 heads out of four flips of a coin we don't have it yet and we're being asked to do it. The only way to do it so far is to write out all the possible outcomes and count them up which is just busy work.

[probability_1.html?seed=27&problem=2](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=27&problem=2&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=27&problem=2&debug&activity=%5B%5D)

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