If the mean and standard deviation of the data set {12,14,19,x} are 15 and √26, respectively, x = ?

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Correct Answer: **A.** *15*

If the mean is 15, the sum of the 4 numbers must be 12 + 14 + 19 + x = 15 × 4 = 60, which yields x = 15. The standard deviation is not required here.

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