Q4. In order to inspect the quality of steel poles production we have selected 20 metal columns from the production line and measured the length (cm L) each piece 17 11 17 13 14 15 18 13 12 14 16 16 15 12 15 15 15 14 16 11 Design specification are: L (15+/-1) cm 1- Study this data (Range, Average, S and variance) 2- What is the percentage of production corresponding to the specifications and the percentage of defective production? 3- Draw the graph of frequency distributions. 4- What the pattern kind of frequency distributions?

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