An automatic filling machine is used to fill 1liter bottles of cola. The machines output is normal with a mean of 1 liter and a standard deviation of 0.02 liter. Output is monitored using means of samples of 25 observations. Compute 3sigma control limits and given the following sample means: 1.007, 1.002, 0.994, 1.010, 0.997,0.998,determine if the process is stable or not.