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is3535

  • one year ago

A music shop has 5 different brands of guitar strings. The 5 different brands sell for $16, $20, $15, $11, and $13. What is the mean absolute deviation of the prices? Round to the nearest cent, if necessary.

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  1. welshfella
    • one year ago
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    First work out the mean selling price

  2. welshfella
    • one year ago
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    then find the difference between the individual prices and the mean and add them up divide this total by 5

  3. is3535
    • one year ago
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    75 divide 5=15

  4. welshfella
    • one year ago
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    right now work out 16 - 15 20-15 15-15 15-11 and 15-13

  5. welshfella
    • one year ago
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    then add these up and divide by 5 to get the MAD

  6. is3535
    • one year ago
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    - or add

  7. welshfella
    • one year ago
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    ??

  8. is3535
    • one year ago
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    15-3 = 12

  9. welshfella
    • one year ago
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    why 15 - 3???

  10. is3535
    • one year ago
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    now work out 16 - 15 20-15 15-15 15-11 and 15-13

  11. welshfella
    • one year ago
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    16 - 15 = 1 20 - 15 = 5 etc

  12. is3535
    • one year ago
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    now what

  13. welshfella
    • one year ago
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    what do you get after adding the those 5 results?

  14. is3535
    • one year ago
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    11

  15. is3535
    • one year ago
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    To get mean you need to add up all the numbers and divided it by how many numbers there are so....\[\frac{ 16+20+15+11+13 }{ 5 }\]

  16. welshfella
    • one year ago
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    add up the 5 results of 16-15 20 - 15 15-15 15-12 and 15 - 13

  17. welshfella
    • one year ago
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    yes - you got the mean already = 15 now we need to find the MAD

  18. is3535
    • one year ago
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    15

  19. is3535
    • one year ago
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    i think it 9

  20. welshfella
    • one year ago
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    yea 15 is the mean then use the mean to work out the MAD by doing those 5 subtractions , adding up the results then divide the total by 5

  21. welshfella
    • one year ago
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    gotta go now study all my posts and you'll get it

  22. is3535
    • one year ago
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    can you just give me the answer

  23. is3535
    • one year ago
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    @Vocaloid

  24. Vocaloid
    • one year ago
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    well, ok, you just found the mean, which is 15, right?

  25. is3535
    • one year ago
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    i got 2.5

  26. Vocaloid
    • one year ago
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    hm, not quite... check your math again

  27. is3535
    • one year ago
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    ok

  28. is3535
    • one year ago
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    2.4

  29. Vocaloid
    • one year ago
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    yup! 2.4 is the right answer

  30. Vocaloid
    • one year ago
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    @is3535: you can use this website to calculate the mean absolute deviation, so you can check your answers in the future! http://www.alcula.com/calculators/statistics/mean-absolute-deviation/

  31. Vocaloid
    • one year ago
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    I mean, you still have to calculate it by hand, but you can use the website to see if you did your math right!

  32. anonymous
    • one year ago
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    did you learn$\equiv$ and $\pmod{}$yet?

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