A cereal company’s family size cereal box contains 20 ounces of cereal, so they aim to maintain the mass of each box to be between 19.80 ounces and 20.20 ounces. To see how their process varies from day to day, they recorded the mass of 50 cereal boxes every day (subgroup size = 50) for 10 consecutive days. The X-Bar chart is stable and capable, indicating that the daily variation is not significant, but it is important to look at the individual masses as they may exceed the specification limits.