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Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
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Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a random variable?
💡 Hint: Think about how outcomes in experiments can be quantified.
Question 2
Easy
Give an example of a discrete random variable.
💡 Hint: Consider things that can be counted.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What are random variables used for?
- To predict outcomes
- To count items
- To measure time
💡 Hint: Think about where uncertainty is present.
Question 2
Is a temperature reading a discrete random variable?
- True
- False
💡 Hint: Consider how temperature can change gradually.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
In a game, a player wins $0, $1, or $2 with probabilities 0.5, 0.3, and 0.2 respectively. Calculate the expected value of their winnings.
💡 Hint: Use the expectation formula with given probabilities.
Question 2
A continuous random variable has a PDF given by f(x) = 3x² for 0 ≤ x ≤ 1. Find the expectation of this variable.
💡 Hint: Integrate the product of x and the PDF within the defined limits.
Challenge and get performance evaluation