Adata set is shown.

110, 112, 156, 115, 124, 168, 132

what is the mean absolute deviation of this data set? round your answer to the nearest tenth if necessary.

answer choices

17

18

58

131

What do we know?

There are 9 black pens and 3 green pens.

What else do we know?

We know that 11 of the pens aren't black, and 5 of them aren't green.

Black pens (9) : red pens (6) : green pens (3)

How'd I get 6?

If 11 pens aren't black, they had to be green, but 5 of them weren't green. So, I subtracted 11 from 5 to get 6 red pens.

I hope that makes sense.

Final

9:6:3

WARNING: I could be wrong as I'm not fully sure, but this is what I think.