SOLUTION: if the mean of a problem is 30 what's the value of x in 78,77,84,81,x

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Question 713786: if the mean of a problem is 30 what's the value of x in 78,77,84,81,x
Answer by solver91311(24713) About Me  (Show Source):
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If the mean of a set of data values is , then the sum of the data values must be

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