Chapter 5: Discrete Probabilities

Question 1

What is a random variable? A random discrete variable?

Answer 1

• RV (capital letter, usually X) indicates the outcome of an experiment (continuous)
• DRV indicates a separate + countable outcome (hence, discrete)

Question 2

normal distribution described by what 2 parameters?

Answer 2

σ and µ

Question 3

what is the standard normal?

Answer 3

µ=0 and σ=1

Question 4

what to do if normal distribution is not standard?

Answer 4

use z substitution (x–µ)/σ
distance from the mean, as measured in standard deviations