The Anderson Lumber Company Has Three Sawmills That Produce Boards

Multiple Choice

The Anderson Lumber Company has three sawmills that produce boards of different lengths.The following table is a joint frequency distribution based on a random sample of 1,000 boards selected from the lumber inventory. Based on these data,if a board is selected that is 12 feet long,the probability that it was made at sawmill A is:

A) 0.08.
B) 0.41.
C) 0.24.
D) 0.20.