Curriculum
Course: Statistics — Third Secondary
Login

Curriculum

Statistics — Third Secondary

Unit 1: Correlation and Regression

0/4

Unit 2: Advanced Statistical Measures

0/2

Unit 3: Probability

0/2

Unit 4: Random Variables

0/4

Unit 5: The Normal Distribution

0/2
Quiz

Expectation and Variance — Lesson quiz

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit
  • Questions count: 2
  • Passing grade: 60%
Start Quiz
1.
What is the formula for the expectation of a discrete random variable?
μ = Σ x²
μ = Σ (x + f(x))
μ = Σ f(x)
μ = Σ (x × f(x))
2.
A variable takes the values 1, 2, 3, 4 with probabilities x ÷ 10 for each value x. Find its variance σ².
3
10
1
2
  • 1
  • 2