A table shows customer service wait time as callers enter the queue. Table: call load q (hundreds of callers): 0, 0.9, 1.1, 1.8, 3; wait time W (min): 4, 4.3, 4.4, 4.5, 5.1. Using only the values in the table, choose the best estimate for the instantaneous rate at q = 1.1 and the best statement about possible error.