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Arrays, vectors, and STL

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If x denotes the mean of a sequence of numbers x1, x2,.....xn, the variance is the average of the squares of the deviations of the numbers from the mean, and the standard deviation is the square root of the variance. Write functions to calculate the mean, variance, and standard deviation of the values stored in an array and a driver program to test your functions.

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Arrays, vector<T>s, and STL are encompassed.

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