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this video provides a description of the mean and range control chart control charts and demonstrates how to create these control charts under the assumption that the process standard deviation is unknown in this case we have 20 samples of 5 stakes measured in weight at a butcher shop the measurements are taken in grams these samples will be used to determine whether the process of cutting the steaks is centered consistently and whether or not the variability in the process is consistent over time so were assuming that these samples are ordered in time and that order has been maintained in the data the first thing we need to do to construct the mean chart is to calculate the sample averages or sample means we simply would use the average formula in Excel and calculate this for the first sample notice that there are five points in each sample and that the number of samples is 20 this can simply be copied down the next thing we need to do is calculate the range when the process standar