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Looking to calculate how many perfect surveys to hit the goal

  1. #1
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    Looking to calculate how many perfect surveys to hit the goal

    Need to calculate how many Customer Satisfaction Surveys with a score of 10 are needed to return to a goal of 9.75

    If a survey is received with a score of zero, thirty nine surveys at 10 are needed to reach a goal of 9.75






    The link below seems to have had this same question and/or answer, however it has been removed.
    http://www.excelforum.com/excel-form...-the-goal.html

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    Forum Expert ben_hensel's Avatar
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    Re: Looking to calculate how many perfect surveys to hit the goal

    This isn't really an excel question, but instead, middle-school algebra.

    Variables:
    Known:
    Nx = number of existing surveys
    Sx = sum of values of existing surveys
    G = goal for the average
    Unknown:
    N10 = number of perfect surveys (eg, result of 10)

    Expression:
    (Sx + 10 * N10) / (Nx + N10) = G
    ;; sum / count = average

    Rearranging:

    N10 = (G * Nx - Sx) / (10 - G)

    Replace the variables with cell references, and that's good-to-go for excel.

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    Re: Looking to calculate how many perfect surveys to hit the goal

    Basically as stated above it's pretty basic math (for some) to get target #.

    1. In column A place each survey score.
    2. In B1 place your goal (9.75)
    3. In C1 paste the Formula below.

    Each time you add a score to coulmn A the number of 10's needed will update in C1.

    Please Login or Register  to view this content.


    Shelton A.
    If Helpful, Add Reputaion!

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    Re: Looking to calculate how many perfect surveys to hit the goal

    Thank you

    PHP Code: 
        A            B
    1    9.702380952   Current CSat average
    2    12            Number of surveys received
    3    9.75          Target Goal
    4    10            Max Score
    5    3             Max scores required to meet goal
    Entered into B5 
    =CEILING(B2*(B1-B3)/(B3-B4),1
    Last edited by Doc Science; 04-25-2014 at 03:55 PM.

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