Statement I : Atomic weight of an element can be fractionalStatement II : An element can have a number of isotopes

Statement I : Atomic weight of an element is fractional, Statement I is trueStatement II : Each element has several isotopes with different isotopic abundance. The mean value of product of mass number of each isotopes and it's abundance is fractional.Thus Statement II is trueStatement I and Statement II are true and Statement II explains Statement I.