A group of nine employees have a mean income of 50 thousand dollars, with a standard deviation of 10 thousand dollars. Four more employees are introduced into the mix, and these employees each have an income of 50 thousand dollars. Find the new standard deviation.

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The Answer of A group of nine employees have a mean income of 50 thousand dollars, with a standard deviation of 10 thousand dollars. Four more employees are introduced into the mix, and these employees each have an income of 50 thousand dollars. Find the new standard deviation.

A Group of Nine Employees Have a Mean Income of 50