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anonymous

  • one year ago

When the outliers are removed, how does the mean change? dot plot with 1 on 18, 2 on 38, 1 on 40, 3 on 44, 1 on 46, 1 on 48 The mean decreases by 2.75. The mean increases by 2.75. The mean increases by 3.25. There are no outliers.

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  1. anonymous
    • one year ago
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    i know the mean increases

  2. anonymous
    • one year ago
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    by 3.25

  3. anonymous
    • one year ago
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    is it?

  4. anonymous
    • one year ago
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    i think so

  5. anonymous
    • one year ago
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    @misssunshinexxoxo

  6. misssunshinexxoxo
    • one year ago
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    I'll check this

  7. anonymous
    • one year ago
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    thank you

  8. misssunshinexxoxo
    • one year ago
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    Pretty sure by 3.25; I'll have a friend check @jim_thompson5910

  9. anonymous
    • one year ago
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    thats what i thought

  10. phi
    • one year ago
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    First , figure out 1 on 18, 2 on 38, 1 on 40, 3 on 44, 1 on 46, 1 on 48 18+2*38+40+3*44+46+48 and then divide by 1+2+1+3+1+1 that is the original mean then figure out 2*38+40+3*44+46+48 and divide by 2+1+3+1+1 that is the new mean

  11. anonymous
    • one year ago
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    its 42 and 1/3

  12. anonymous
    • one year ago
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    witch simplifys to 3.25

  13. phi
    • one year ago
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    What did you get for 18+2*38+40+3*44+46+48 ?

  14. anonymous
    • one year ago
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    360

  15. phi
    • one year ago
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    and what do you get for 1+2+1+3+1+1 ?

  16. anonymous
    • one year ago
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    9

  17. phi
    • one year ago
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    the average is the sum of all the numbers (i.e. 360) divided by the number of numbers (i.e. 9) so the first mean is 360/9 = what ?

  18. anonymous
    • one year ago
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    40

  19. phi
    • one year ago
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    now we "toss out the outlier" which is the number that seems "far away" from the others. in this case, the 18 seems far away so now we add up all the numbers 360 take away 18 we get 360-18 = 342 and instead of 9 numbers, we now have 8 numbers. the new mean is 342/8 = what ?

  20. anonymous
    • one year ago
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    42.75

  21. phi
    • one year ago
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    so old mean was 40, new mean is 42.75 the new mean is bigger by how much ?

  22. anonymous
    • one year ago
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    2.75

  23. phi
    • one year ago
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    and that is choice B

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