Problem # 3 (a) Using the short method compute the arithmetic mean and sample standard deviation of the frequency distribution obtained from the table below: Hint: Choose 350.0 as the assumed origin. (b) What percentage of the area under the normal curve will fall between limits of 347.25 and 352.75? X (midpoint) 353.0 352.5 352.0 351.5 351.0 350.5 350.0 349.5 349.0 348.5 348.0 347.5 347.0 f (frequency) 123r∞ 2 7 8 12 15 18 16 10 4 1 3

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