Explain why the method used in part (b) is an approximation of the mean rather than the actual mean. Choose the correct answer below. A. It is an approximation because the left side of the bin was used to estimate the data values contained in the bin. B. It is an approximation because the values were averaged within each bin before calculating the approximation. C. It is an approximation because the amount of values within each bin was guessed. D. It is an approximation because the right side of the bin was used to estimate the data values contained in the bin