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Homework Help: Integral Average Question

  1. Oct 16, 2005 #1
    A certain city, the temp in degrees Farenheit, t hrs after 9 am was modeled by the function: T(t)=50 + 14 sin (Pi t / 12)
    Find avg temp during the period from 9 am to 9 pm.

    What i did was take the Int[50 + 14 sin (Pi t / 12),t,0,9]... but this doesnt produce the answer. It says model after 9 am so at 9=0 for a , b = 10 for 9pm?
    Any help?
     
  2. jcsd
  3. Oct 16, 2005 #2
    shouldnt b be 12 and not 10 since it is 12 hours from 9am - 9pm
     
  4. Oct 16, 2005 #3

    Fermat

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    Set your limits a,b to a = 9 and b = 21 (using 24-hr notation)
     
  5. Oct 16, 2005 #4
    i tried 9 to 21 and it didnt work before...
     
  6. Oct 16, 2005 #5
    it works from 0 to 12, thanks, dont know why i thought 10 DUH
     
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