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

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

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

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

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

6. 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

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