Refer to the following distribution 
What is the relative frequency associated with a score of 9?
Definitions:
Regression Equation
An equation in mathematics employed to forecast the value of a dependent variable using one or more independent variables.
Unit Increase
A single increment or step up in quantity, size, or number in a given context.
Holding Constant
A method in analysis where certain variables are kept unchanged to isolate the effect of other variables.
Second-order Model
A statistical or mathematical model that includes not only the main effects but also their interactions and quadratic terms, enabling the capture of curvature in the data relationships.
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