A chemical company sells a specialized industrial lubricant in 20 liter containers. a random sample of the latest production lot shows the contents of 10 containers to be 19.52, 19.61, 19.62, 20.3, 19.74, 19.88, 19.9, 19.8, 20.97, and 20.92 liters. find the standard deviation of the sampled containers’ contents.