What is the mean absolute deviation for the data?

30, 35, 35, 40, 55

A.
5

B.
6.4

C.
6.8

D.
25

Question

What is the mean absolute deviation for the data? 

30, 35, 35, 40, 55
 
 A.
5
 
 B.
6.4
 
 C.
6.8
 
 D.
25

anonymous · Answer

is it C?

anonymous · Answer

@misty1212

astrophysics · Answer

You have to use this $$\frac{ \sum |x- \mu| }{ N }$$
So start of by finding the mean which is your mu, and x is each value and n is the amount of number of values you have.

astrophysics · Answer

It will be easier if you make a little chart for yourself for the absolute deviations

anonymous · Answer

?

astrophysics · Answer

I guess you just want the answer?

anonymous · Answer

not really i want to know why is the answer that answer so i wont get confused later on.

astrophysics · Answer

So the formula I showed you, does that look familiar?

anonymous · Answer

Nope

astrophysics · Answer

Well how did you get c?

astrophysics · Answer

Start off by making a chart, |dw:1429147789828:dw| now find the mean first

anonymous · Answer

idk i actually got 39...

astrophysics · Answer

That's ok, least you're being honest now.

What is the mean?

astrophysics · Answer

Remember mean is just the average

anonymous · Answer

39...

astrophysics · Answer

Ok good, so the mean is 39.

astrophysics · Answer

Now take that value and subtract it from the x |x-mu|

astrophysics · Answer

So |30-39| etc, fill the chart out.

anonymous · Answer

? :/

astrophysics · Answer

Where are you confused, fill this chart out|dw:1429148477226:dw|

astrophysics · Answer

We need to do this so we can use the formula I showed you for mean deviation

anonymous · Answer

ok but can we plz hury becuase i have to go to bed in like 10 min and i have to do 12 other problems... :/

astrophysics · Answer

Well, I'm not doing your work for you. I explained everything you need for the problem, if you're not even going to attempt it I have no reason to continue, you should be grateful for getting FREE help. Anyways, good luck.

anonymous · Answer

Ok well thx :D for your help and i am gratefull but i was in a real rush becuase i had to go eat dinner. I didnt need to go to bed i needed to go eat dinner :P Well sryy if you thought you were doing my homework for you :/... Well anyways Thx for your help! :3

anonymous · Answer

*for me

anonymous · Answer

Also, i got C for my answer. Thank you for helping me understand! :D
Bye

astrophysics · Answer

Np, I'm glad I helped, if you need more help you are more than welcome to tag me!