MDM4U Practising Expected Value – 2015-11-16

We worked some more on Expected Value, taking special notice of random variables with the Uniform Probability Distribution.

The Expected Value of a random variable X is

$latex E(X)=\sum_{i=1}^{n}{P(x_i)\cdot x_i} $

If X has a uniform distribution, P(x_i) = \frac{1}{n} for every outcome x_i , so we can simplify the expected value:

$latex E(X)=\frac{1}{n}\sum_{i=1}^{n}{x_i} $

Need some practice? Try questions starting on page 375.

We started to talk really briefly about the Binomial Distribution – that’s the plan for tomorrow.


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