A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair times (in days): 6, 6, 6, 8, 6, 5, 6, 8, 3, 5, 6, 8.

Calculate the test statistic.(Round your answer to 3 decimal places.)

Test statistic_____