Algebraic method

A company produces regulation Ultimate Discs. The discs have a mean mass of 175.0 g. A quality control manager samples the discs randomly and determines, based on the sample size, that their masses lie in the range of 174.8 g to 175.2 g, 19 times out of 20. Determine the confidence interval, margin of error and confidence level this company is using for its quality control tests. (2 marks)