Health, 16.06.2021 07:30, allenlog000

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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the combined mean and variance of salary of 250 workers of city A and B are 560 and 5497 respectivel...