Mal Foil the owner of Firefly Shipping has asked you to build a model to project the number of units they must be prepared to ship in the first month of the new year. Mal has supplied you with a template of what he would like to see.

Mal also has a specific set of requirements:

use a 3-month weighted average to forecast January.

see how the 3-month weighted average method would perform against historical data.

see the 3-month weighted average charted out within the model.

Mal is not sure how what weights he would like to use. Your model should allow him to adjust the weights, listed in G4-I4, and see these changes change the models output.

The 3-month weighted average formula is listed below:

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Ft = The forecasted values (column D)

Wt-X = the weight for the prior months. For example, if Ft = April then, Wt-1 would equal to March, Wt-2 would equal February and Wt-3 would equal January.

Ut-X = the units for the prior months, similar to how the weights work