Learn Without Walls

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Module 4 Post-Assessment

Measure your learning gains after completing the module

About This Assessment

Congratulations on completing Module 4! This post-assessment uses the same questions as the pre-assessment to measure your learning gains. Compare your scores to see how much you've improved!

Same 5 questions as the pre-assessment
No time limit – take your time
See your improvement – we'll show how much you've learned
This data helps demonstrate the effectiveness of the learning platform

What is a random variable?

A variable that changes randomly without any pattern
A numerical value that results from a random experiment or chance process
A variable that can only take on whole number values
Any variable in a probability problem

Which of the following is a discrete random variable?

The weight of a randomly selected student
The number of heads when flipping a coin 10 times
The exact time it takes to run a marathon
The temperature at noon on a random day

What does the expected value E(X) represent?

The value that occurs most frequently
The long-run average value of the random variable
The middle value when all outcomes are ordered
The most likely outcome of an experiment

For a valid discrete probability distribution, which condition must be TRUE?

All probabilities must be equal
The sum of all probabilities must equal 1
Each probability must be greater than 0.5
There must be exactly 5 possible outcomes

Which of the following situations can be modeled using a binomial distribution?

Rolling a die 20 times and recording the number shown
Flipping a coin 50 times and counting the number of heads
Measuring the heights of 30 randomly selected adults
Selecting 5 cards from a deck without replacement and counting aces

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