3.1 - 1

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold CostSunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

3.1 - 2

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Identify which column is the variable (x) and which column is the weights (w).

Model Number Sold CostSunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

3.1 - 3

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Identify which column is the variable (x) and which column is the weights (w).

Model Number Sold CostSunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

3.1 - 4

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Identify which column is the variable (x) and which column is the weights (w).- The values you are finding the weighted mean of is the variable

Cost is the variable (x)

Model Number Sold Cost (x)Sunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

3.1 - 5

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Identify which column is the variable (x) and which column is the weights (w).- The values you are finding the weighted mean of is the variable

Cost is the variable (x)- Use the Number Sold (w) as the weights. The Sunscraper will be weighted more because more Sunscraper models were sold.

Model Number Sold (w) Cost (x)Sunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

3.1 - 6

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x)Sunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

w

xwX

)(

3.1 - 7

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x)Sunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

w

xwX

)( Create a column for w∙x

3.1 - 8

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000

Skycoaster 6 $365,000High-flyer 12 $725,000

w

xwX

)( Create a column for w∙x

3.1 - 9

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000High-flyer 12 $725,000

w

xwX

)( Create a column for w∙x

3.1 - 10

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000

w

xwX

)( Create a column for w∙x

3.1 - 11

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)( Create a column for w∙x

3.1 - 12

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)( Sum the column of w∙x

3.1 - 13

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)( Sum the column of w∙x

Σ(w∙x) = 14,733,000

3.1 - 14

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)(

Sum the column of w

Σ(w∙x) = 14,733,000

3.1 - 15

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)(

Sum the column of w

Σ(w∙x) = 14,733,000 Σw = 27

3.1 - 16

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

w

xwX

)(

Σ(w∙x) = 14,733,000 Σw = 27

3.1 - 17

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

27000,733,14)(

w

xwX

Σ(w∙x) = 14,733,000 Σw = 27

3.1 - 18

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

6.666,54527000,733,14)(

w

xwX

Σ(w∙x) = 14,733,000 Σw = 27

3.1 - 19

Desk Work 6: Helicopter CostsThe costs of three models of helicopters are shown here. Find the weighted mean of the costs of the models.

Model Number Sold (w) Cost (x) w∙x

Sunscraper 9 $427,000 9×427,000 = 3,843,000

Skycoaster 6 $365,000 6×365,000 = 2,190,000High-flyer 12 $725,000 12×725,000 = 8,700,000

6.666,54527000,733,14)(

w

xwX

Σ(w∙x) = 14,733,000 Σw = 27

The weighted mean of the helicopter costs is $545,667.