the combined mean and variance of salary of 250 workers of city A and city B are 500 and 5497 respectively. the mean and variance of salary of 150 workers of city B are 500 and 81 respectively. find the variance of the salary in city A
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the combined mean and variance of salary of 250 workers of city A and city B are 500 and 5497 respectively. the mean and variance of salary of 150 workers of city B are 500 and 81 respectively. find the variance of the salary in city A
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