What is the expected value of the random variable X, defined as the number of workouts in a week?

Understanding Random Variables and Their Properties

Interactive Video
•
Mathematics, Science
•
9th - 12th Grade
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Easy

Olivia Brooks
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4.2
3.0
2.1
1.5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which Greek letter is commonly used to denote the mean of a population?
Alpha
Mu
Sigma
Beta
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in calculating the variance of a random variable?
Add all outcomes together
Square each outcome
Subtract the mean from each outcome
Multiply each outcome by its probability
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the variance of a random variable?
Sum of probabilities
Sum of differences from the mean
Sum of squared differences from the mean
Product of outcomes and probabilities
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the variance of the random variable X?
0.89
1.19
1.09
2.1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the standard deviation of the random variable X?
0.89
1.19
1.09
2.1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the standard deviation related to the variance?
It is half the variance
It is the square root of the variance
It is the square of the variance
It is twice the variance
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