19. The lling machine at a bottling plant is operating correctly when the variance of the ll amount is equal to 0.3 ounces. Assume that the ll amounts follow a normal distribution. What is the probability that for a sample of 30 bottles, the sample variance is greater than 0.5? a. Between 0.05 and 0.06 b. Between 0.01 and 0.025 c. Between 0.03 and 0.04 d. None of the above