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.​

Drug that change your sense of and make you see and hear thing that are not real

Wheeled coach ambulance uses an interactive computer program to develop and document its products. what is it called?

For years, tobacco products have included a message from the surgeon general warning the negative effects of tobacco use. at this time, a push is being made for the fda to begin to regulate e-cigarettes in order to mandate warning labels and age restrictions. write a paragraph that identifies 2 health problems that have been linked to nicotine and/or tobacco use. you should include statistics demonstrating the incidence of problems among smokers and provide a resource citing where you found the information provided. (remember from unit 1 what makes a resource reliable.) due in 2