What is the random variable of interest when rolling a four-sided die three times?
Data Science and Machine Learning (Theory and Projects) A to Z - Expectations: Homework

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average of the rolls
The sum of the rolls
The minimum roll
The maximum roll
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a random variable has a uniform PMF, what does it imply about the likelihood of its values?
Values are not possible
Values are inversely proportional
All values are equally likely
Some values are more likely than others
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the expected value of a random variable with a uniform PMF?
By finding the median of the values
By averaging all possible values
By summing the values
By multiplying the values
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for calculating the variance of a random variable?
Expected value of X squared
Expected value of (X minus the mean) squared
Expected value of X to the power of 4
Expected value of X minus the mean
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the fourth moment of a random variable represent?
Expected value of X to the power of 5
Expected value of X to the power of 4
Expected value of X cubed
Expected value of X squared
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