STARBUCKS METHOD:

density of coffee beans: 561 kg/m^3 = 1.237 lb/liter
(assuming this doesn't include the air surrounding the beans)

5 lb of coffee = (5 lb)(1/1.237 liter/lb) = 4.042 liters

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STARBUCKS METHOD:
5 lb coffee + 14 liter water

coffee to water mass ratio = 2.268 kg / 14 kg = 0.162

coffee to water volume ratio = 4.042 liter / 14 liter = 0.289