Q2. Suppose we have a class DataSet, and it represents a set of numerical data. The class has an overloaded constructor that accepts a vector of doubles, and has a member function calculateMean() that calculates the mean of the data. Overload the '+' operator to allow us to combine two DataSet objects and obtain a new DataSet object that contains the combined data (the total number of elements will be a sum of the number of elements in each dataset). Write a main program to create two objects of Data Set with different number of elements each and test the overloaded "+" operator and then, find the mean of the combined data.

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