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It is required to estimate the number of message buffers in use in the main memory of the computer system at Power Products Ltd

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It is required to estimate the number of message buffers in use in the main memory of the computer system at Power Products Ltd. To do this, 20 programs were run, and the number of message buffers in use were found to be

141, 146, 157, 151, 152, 140, 142, 156, 150, 140,139, 135, 143, 146, 146, 152, 140, 136, 149, 148

Calculate the average number of buffers used. What is the standard deviation? Would you say these data are skewed?