Question: Please answer this 4. Write two functions, called mean and var, that return the mean and variance of the input argument, which should be a

Please answer this 4. Write two functions, called mean and var,

Please answer this

4. Write two functions, called mean and var, that return the mean and variance of the input argument, which should be a vector. So the first of these would be of the form: double mean (const vector. Test all of these functions on a vector containing the elements {1,2,3,4,5). The mean and variance should be 3 and 2.5 respectively

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