1.Probability, Statistics

1. MECE:all events are mutually exclusive and collectively exhaustive

2. Random Variable:

*Probability Mass Function (PMF): a discrete distribution of outcomes X can produce

*Probability Density Function (PDF): a continuous distribution of outcomes X can produce

3. Standard Normal Distribution

4. Formula: Z = (X - m)/s , X = m + s Z

mean (m) and the standard deviation (s)