- 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.

- jamiebookeater

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- welshfella

First work out the mean selling price

- welshfella

then find the difference between the individual prices and the mean and add them up
divide this total by 5

- is3535

75 divide 5=15

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## More answers

- welshfella

right
now work out
16 - 15
20-15
15-15
15-11
and 15-13

- welshfella

then add these up and divide by 5 to get the MAD

- is3535

- or add

- welshfella

??

- is3535

15-3 = 12

- welshfella

why 15 - 3???

- is3535

now work out
16 - 15
20-15
15-15
15-11
and 15-13

- welshfella

16 - 15 = 1
20 - 15 = 5
etc

- is3535

now what

- welshfella

what do you get after adding the those 5 results?

- is3535

11

- 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

add up the 5 results
of 16-15
20 - 15
15-15
15-12
and 15 - 13

- welshfella

yes - you got the mean already = 15
now we need to find the MAD

- is3535

15

- is3535

i think it 9

- 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

gotta go now
study all my posts and you'll get it

- is3535

can you just give me the answer

- is3535

- Vocaloid

well, ok, you just found the mean, which is 15, right?

- is3535

i got 2.5

- Vocaloid

hm, not quite... check your math again

- is3535

ok

- is3535

2.4

- Vocaloid

yup! 2.4 is the right answer

- 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

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

did you learn$\equiv$ and $\pmod{}$yet?

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