

Variance and Standard Deviation Concepts
Interactive Video
•
Mathematics
•
9th - 10th Grade
•
Practice Problem
•
Hard
Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What values can the discrete random variable X take in the given example?
3, 4, 5, 6
2, 3, 4, 5
1, 2, 3, 4
0, 1, 2, 3
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for calculating the variance of a discrete random variable?
VAR(X) = E(X^2) - μ^2
VAR(X) = E(X^2) + μ^2
VAR(X) = E(X) - μ
VAR(X) = μ^2 - E(X^2)
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is E(X^2) calculated for a discrete random variable?
Sum of X cubed times probability
Sum of X squared times probability
Sum of X divided by probability
Sum of X times probability
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mean (μ) of the discrete random variable in the example?
4
5
3
2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which formula is used to calculate the mean of a discrete random variable?
μ = Sum of X times probability
μ = Sum of X squared times probability
μ = Sum of X divided by probability
μ = Sum of probability divided by X
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the variance of the discrete random variable in the example?
0
1
2
3
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the standard deviation of a discrete random variable calculated?
Mean divided by variance
Variance divided by mean
Square of the variance
Square root of the variance
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