Test 4 Score

Discussion in 'Basic Math' started by nycmathguy, Jul 3, 2022.

  1. nycmathguy

    nycmathguy

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    Screenshot_20220703-173716_Samsung Internet.jpg

    Let s = test 4 score

    (88 + x)/2 = 90

    Correct set up?
     
    nycmathguy, Jul 3, 2022
    #1
  2. nycmathguy

    MathLover1

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    (88+88+88 + x)/4 = 90

    (x + 264)/4 = 90
    x + 264= 90*4
    x = 360-264
    x = 96 -> 4th test must be 96
     
    MathLover1, Jul 3, 2022
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  3. nycmathguy

    nycmathguy

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    Your set up was my first choice.
     
    nycmathguy, Jul 4, 2022
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  4. nycmathguy

    HallsofIvy

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    The average of a list of numbers is the sum divided by the number of numbers in the list.
    To find the average of these 4 numbers we must first add them. We want to find the fourth number so call that x,
    We do not know the first 3 numbers but we know their average is 88 so we know their sum is 3(88)= 264. We want (264+ x)/4= 90. 264+ x= 4(90)= 360. x= 360- 264= 96.
     
    HallsofIvy, Aug 16, 2022
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  5. nycmathguy

    nycmathguy

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    That's simple enough. Thanks.
     
    nycmathguy, Aug 17, 2022
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