In a distribution with mean 50 and standard deviation 10, what is the coefficient of variation?

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The average of $6$ numbers is $27$ . When a new number, $41$ , is added, what is the new average?
The average of $7$ numbers is $26$ . When a new number, $34$ , is added, what is the new average?
The average of $6$ numbers is $32$ . When a new number, $46$ , is added, what is the new average?
The average of $4$ numbers is $31$ . When a new number, $46$ , is added, what is the new average?
The average of $4$ numbers is $39$ . When a new number, $49$ , is added, what is the new average?
Seven distinct positive integers have a mean of $12$ and a median of $15$ . What is the greatest possible value of the largest integer?

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