Find the value of x in the equation 9-4x=57

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Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?