Relative atomic mass problem?

Please tell me how to calculate the relative atomic mass of this sample of germanium?

^70Ge = Relative abundance: 22.60%

^72Ge = Relative abundance: 25.45%

^74Ge = Relative abundance: 36.73%

^76Ge = Relative abundance: 15.22%

Update:

Is the answer 7289.14?

Comments

  • - Relative atomic mass = percentage x molar mass

    --> (22.60 /100 ) x 70 = 15.82

    --> (25.45/100 ) x 72 = 18.324

    --> (36.73/100 ) x 74 = 27.1802

    --> (15.22/100 ) x 76 = 11.5672

    Relative atomic mass is equal to 15. 82 + 18.32 + 27.1802 + 11.5672 =72.8914 not 7289.14

    Relative atomic mass is 72.8914

    :)

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    RE:

    Relative atomic mass problem?

    Please tell me how to calculate the relative atomic mass of this sample of germanium?

    ^70Ge = Relative abundance: 22.60%

    ^72Ge = Relative abundance: 25.45%

    ^74Ge = Relative abundance: 36.73%

    ^76Ge = Relative abundance: 15.22%

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