Question

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.

Answer 1

First work out the mean selling price

Answer 2

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

Answer 3

75 divide 5=15

Answer 4

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

Answer 5

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

Answer 6

- or add

Answer 7

??

Answer 8

15-3 = 12

Answer 9

why 15 - 3???

Answer 10

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

Answer 11

16 - 15 = 1
20 - 15 = 5

etc

Answer 12

now what

Answer 13

what do you get after adding the those 5 results?

Answer 14

11

Answer 15

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

Answer 16

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

Answer 17

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

Answer 18

15

Answer 19

i think it 9

Answer 20

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

Answer 21

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

Answer 22

can you just give me the answer

Answer 23

@Vocaloid

Answer 24

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

Answer 25

i got 2.5

Answer 26

hm, not quite... check your math again

Answer 27

ok

Answer 28

2.4

Answer 29

yup! 2.4 is the right answer

Answer 30

@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/

Answer 31

I mean, you still have to calculate it by hand, but you can use the website to see if you did your math right!

Answer 32

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