Standard Deviation for Probability Distributions

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Presentation transcript:

Standard Deviation for Probability Distributions Mr. Snyder Why??? WHy??? WHY??? Because Bob Ross says so!

From Last time… Mean of a discrete random variable: Probability for that give value Value for variable

Example x P(x) 1 0.16 2 0.22 3 0.28 4 0.20 5 0.14 Mean

Expected Value The mean is the expected value FOOL!!!

A word from sir waka flocka Hi I’m waka flocka and you can find the standard deviation too… Here is the formula:

Let’s TRY!!! So we found the mean of out sales it was 2.94 x P(x) 1 0.16 2 0.22 3 0.28 4 0.20 5 0.14

You Try!!! x P(x) 0.30 1 0.25 2 3 0.15 4 0.05