Calculating Expected Value
Grade 12th Grade · Math · 60 min
What's Included
Learning Objective
I can calculate the expected value of a random variable.
Warm-Up Video
Khan Academy · 4:32
Mean (expected value) of a discrete random variable | AP Statistics | Khan Academy
Guided Notes
3 key concepts
- 1
A discrete random variable has a finite number of values, and a valid probability distribution has a combined probability of one.
- 2
The expected value of a discrete random variable is the weighted sum of the various outcomes, weighted by their probabilities.
- 3
The expected value, or mean, of a random variable can be a non-integer value even if the random variable only takes on integer values.
Practice Questions
12 questions · Multiple choice & Short answer & True/false
Exit Ticket
Quick comprehension check
“A discrete random variable Y represents the number of days per week a person exercises. The probability distribution is as follows: P(Y=0) = 0.2, P(Y=1) = 0.1, P(Y=2) = 0.3, P(Y=3) = 0.4. What is the expected value of Y? Show your work.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
