Kris is staining 30 wooden rectangular fence pieces. The fence pieces are different sizes, and Kris wants
to determine the approximate number of square feet of paint she will need. She decides to take a sample
of 4 fence pieces and calculate the mean of the areas instead of calculating the area of each fence piece.
Which is a true statement about this problem?

A. The sample size is 30,

B. The population is the 4 fence pieces

C. The mean area of the 4 fence pieces is a parameter

D. The mean area of the 4 fence pieces multiplied by 30 would be similar to the total area.