UPSKILL MATH PLUS
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1. The mean of \(5\), \(9\), \(x\), \(17\) and \(21\) is \(13\), then find the value of \(x\).
2. The mean of the square of first \(11\) natural numbers is .
3. The mean of a set of numbers is \(\overline X\). If each number is multiplied by \(z\), the mean is
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