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THE AVERAGE MARK OF 4 GIRLS IN A SCIENCE TEST IS 6,THE MARKS OF 3 OF ZM ARE 5,7,4.FIND THE MARK OF THE 4TH GIRL.

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First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.

Mean = ∑x/n

6 = (5+7+4+x)/4

Solve for x.

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