1 min read•june 3, 2020

Kanya Shah

The main takeaway from this section should be knowing how to calculate and interpret the standard deviation and mean.

The mean is the balance point of a distribution. Formula: *Summation(xi*pi)= mean of X*

The** standard deviation of a discrete random variable** measures how much the values of the variable typically vary from the mean.

The** variance **of X is *SD^2= summation(xi-mean of x)^2 * pi* .

The standard deviation of X is the square root of the variance so *SD = sqrt(summation(xi-mean of x)^2 * pi)*.

🎥**Watch: AP Stats - ****Probability: Random Variables, Binomial/Geometric Distributions**

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