A manufacturer of PVC plastic pipes measures the weight of ten 10-ft-Iong pipes to determine some statistical data for each production batch. The following data have been produced for the weight (in pounds) of a sample of 10 pipes:
6.75, 6.68, 6.70, 6.64, 6.69, 6.66, 6.77, 6.71, 6.62, 6.64
Calculate the mean and standard deviation for the sample, and estimate the standard deviation of the mean value