A fair six-sided die, with sides numbered 1 through 6, will be rolled a total of 15 times. Let x1¯¯¯¯¯ represent the average of the first ten rolls, and let x2¯¯¯¯¯ represent the average of the remaining five rolls. What is the mean μ(x1¯¯¯¯¯¯−x2¯¯¯¯¯¯) of the sampling distribution of the difference in sample means x1¯¯¯¯¯−x2¯¯¯¯¯?.