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A certain element X has four isotopes. • 4.350% of X has a mass of 49.94605 amu. • 83.79% of X has a mass of 51.9405 amu. • 9.500% of X has a mass of 52.94065 amu. • 2.360% of X has a mass of 53.93888 amu. What is the average atomic mass of element X? Express your answer numerically to four significant figures.