A confidence interval is centered around a: I. Parameter
II. Statistic
III. Measure of Variance.

A) I and II only
B) I only
C) II only
D) II and III only
E) III only

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho

Arectangle is a quadrilateral and a parallelogram.here is all that apply to a rectangle!