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Thread: Need help with the Mean formula

  1. #11
    Elite Member
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    Quote Originally Posted by Inferno View Post
    50x10= 500

    500+20= 520

    520/6 = 86.7

    still wrong? lol
    In the third line - why are you dividing by '6'?

    You started 50 data points (n = 50) - you added one more. How many data points do you have now?
    “... mathematics is only the art of saying the same thing in different words” - B. Russell

  2. #12
    oh I guess I was looking at the 6 from Set A.

    so

    51x10= 510

    510+20= 530

    530/51 = 10.4?

  3. #13
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    Quote Originally Posted by Inferno View Post
    oh I guess I was looking at the 6 from Set A.

    so

    51x10= 510

    510+20= 530

    530/51 = 10.4?
    Still wrong .... you are not thinking straight:

    old sum → 50 * 10 = 500

    new sum → 500 + 20 = 520

    New average = 520/51 = 10.196
    “... mathematics is only the art of saying the same thing in different words” - B. Russell

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