the combined mean and variance of salary of 250 workers of city A and B are 560 and 5497 respectively. The mean and variance of the salary of 1850 workers of city B are 581 respectively. Find the variance of salary in city a.​

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Answer in 2009 barack obama signed into law the family smoking prevention and tobacco control act, the new law (h.r.   1256) represents the most sweeping action taken to date to reduce what remains the leading preventable cause of death in the united states;