is3535
  • is3535
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.
Mathematics
jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
First work out the mean selling price
welshfella
  • welshfella
then find the difference between the individual prices and the mean and add them up divide this total by 5
is3535
  • is3535
75 divide 5=15

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welshfella
  • welshfella
right now work out 16 - 15 20-15 15-15 15-11 and 15-13
welshfella
  • welshfella
then add these up and divide by 5 to get the MAD
is3535
  • is3535
- or add
welshfella
  • welshfella
??
is3535
  • is3535
15-3 = 12
welshfella
  • welshfella
why 15 - 3???
is3535
  • is3535
now work out 16 - 15 20-15 15-15 15-11 and 15-13
welshfella
  • welshfella
16 - 15 = 1 20 - 15 = 5 etc
is3535
  • is3535
now what
welshfella
  • welshfella
what do you get after adding the those 5 results?
is3535
  • is3535
11
is3535
  • is3535
To get mean you need to add up all the numbers and divided it by how many numbers there are so....\[\frac{ 16+20+15+11+13 }{ 5 }\]
welshfella
  • welshfella
add up the 5 results of 16-15 20 - 15 15-15 15-12 and 15 - 13
welshfella
  • welshfella
yes - you got the mean already = 15 now we need to find the MAD
is3535
  • is3535
15
is3535
  • is3535
i think it 9
welshfella
  • welshfella
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
welshfella
  • welshfella
gotta go now study all my posts and you'll get it
is3535
  • is3535
can you just give me the answer
is3535
  • is3535
Vocaloid
  • Vocaloid
well, ok, you just found the mean, which is 15, right?
is3535
  • is3535
i got 2.5
Vocaloid
  • Vocaloid
hm, not quite... check your math again
is3535
  • is3535
ok
is3535
  • is3535
2.4
Vocaloid
  • Vocaloid
yup! 2.4 is the right answer
Vocaloid
  • Vocaloid
@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/
Vocaloid
  • Vocaloid
I mean, you still have to calculate it by hand, but you can use the website to see if you did your math right!
anonymous
  • anonymous
did you learn$\equiv$ and $\pmod{}$yet?

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