Refer to the information provided in Figure 1.7 below to answer the questions that follow. 
Figure 1.7
-The slope of a horizontal line is
Definitions:
Probability
A statistical measure that quantifies the likelihood of a specific event occurring within a set of conditions or experiments.
Normal Model
A statistical model based on the Normal (or Gaussian) distribution, characterized by a symmetrical bell-shaped curve indicating data dispersion.
Presale Testing
An assessment process used by companies to evaluate the viability, market potential, or functionality of a product before it is launched to the public.
Random
The lack of pattern or predictability in events, often referring to a selection method where each item has an equal chance of being chosen.
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