If the arithmetic mean of \( 7,8, x, 11,14 \) is \( x \), then \( x... VIDEO
If the arithmetic mean of \( 7,8, x, 11,14 \) is \( x \), then \( x= \)
(1) 9
(2) 9.5
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(3) 10
(4) 10.5
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