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Calculus (please check my answer)

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Find the Avrage value of the function i=15(1-e to the power of -1/2 t) from t=0 and t=4?

A.7.5 sqrt 1+4e^-2 -e^-4 <<<<not sure though
B.7.5 sqrt 4-2e^-2 + e^-4
C.7.5 sqrt 4+4e^-2 - e^-4
D.7.5 sqrt 5-2e^-2 + e^-4

  • Calculus-typo? - ,

    I integrated the expression
    and got: 15(1-e^(-t/2)).

    When evaluated from 0 to 4 I got:
    Divide by (4-0) gives 7.5(e^-2+1)=8.5

    Could there be a typo somewhere?

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