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,the probability of selecting a board from inventory that is 10 feet long is:

A) 0.196.
B) 0.450.
C) 0.084.
D) 0.170.