Write a program that includes two functions named and variance. The function should calculate and return the average of values stored in an array named testvals. The array should be declared in main and include the values 89, 95, 72, 83, 99, 54, 86, 75, 92, 73, 79, 75, 82 and 73. The variance function should calculate and return the variance of the data. The variance is obtained by subtracting the average from each value in, squaring the value obtained, adding them, and dividing by the number of elements in The values returned from calcavg() and variance() should be displayed by using cout statements in main