The density curve must satisfy two important conditions.
These two conditions are: 1- The total area under the density curve MUST BE equal to 1. (Area total = 1) 2- Every point that is on the curve must have a vertical height that is equal to or greater than zero (vertical height for each point ≥ zero)<span> </span>
D.The function is decreasing for all real values of x where x < 1.5
Step-by-step explanation:
The vertex is at x=1.5, so the function is decreasing on one side of that and increasing on the other. Any answer choice with some number other than 1.5 as the boundary of increasing/decreasing can be ignored.
Of course one descriptor (<em>increasing</em> or <em>decreasing</em>) is not applicable for any interval that includes the point where the slope changes sign.
The function is decreasing for all real values of x where x < 1.5.
