Yippee, finally done

Sale 1, I'm not sure if it should be included, it's so far away from the deviation of the mean

Sale 1 OUTLIER

http://www.tf2outpost.com/trade/26418146 Sold for Smoking Bonk + Spec KS Aussie SMG + 5.5 keys of sweets

B/O for Juju was 24

Bonk and SMG had no trade, presuming offered

X = 14.5*0.9 + 12.1*0.9 + 5.5*0.9

X = 29

X = 24 (B/O)

Bonk http://backpack.tf/item/931334839

SMG http://backpack.tf/item/2841415711

Juju http://backpack.tf/item/1730908688

Mini for Bonk

http://backpack.tf/vote/id/5604ef52dea9e946438b4611 14.5, using 14.5

Sale 2

[No OP Trade] Sold with UHHH Axe for C9 Gridiron + Smoking Billy

X + 2.75 = 12*0.9 + 12*0.9

X = 19

Gridiron http://backpack.tf/item/2680574725

Billy http://backpack.tf/item/1107190623

Axe http://backpack.tf/item/166006332

Juju http://backpack.tf/item/1393837530

Mini for Gridiron

Price is 3 months old and i would normally use that, but a month unsold at 12 proves otherwise http://www.tf2outpost.com/trade/26314162

Mini for Billy

[No OP Trade] Sold for 8 keys + White Bill's + 1.3 keys of sweets

X = 8 + 1.3*0.9 + 3.4*0.9

X = 12

Keys and Stuff https://gyazo.com/dae0ed0cebfb6e8da4949f5d88b5736d http://backpack.tf/profiles/76561198065555254?time=1442041200&compare=1442127600

Billy http://backpack.tf/item/1107190623

Sale 3

http://www.tf2outpost.com/trade/26534951 Sold for 19 keys

B/O for Juju was 19

X = 19

Keys https://gyazo.com/e0b379aca1202fb77eec01802ab07c94 http://backpack.tf/profiles/76561198084056439?time=1437634800&compare=1437980400

Juju http://backpack.tf/item/1393837530

Sale 4 OUTLIER

http://www.tf2outpost.com/trade/27028372 Sold for 16 keys

X = 16

Keys https://gyazo.com/ff0e66d5a249aaf2d8dd325f2842cd08 http://backpack.tf/profiles/76561198145940774?time=1443078000&compare=1442991600

Juju http://backpack.tf/item/1339238122

Why Sale 4 is an outlier: http://www.tf2outpost.com/trade/27102779 Got 2 offers in a day regarding buying the hat for 17 keys, within a couple hours of posting