The cumulative average-time learning model with a 90% learning curve indicates that if it takes 100 minutes to manufacture the first unit of a new model, then the second unit will take only 90 minutes to manufacture.

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The cumulative average-time learning model with a 90% learning curve indicates that if it takes 100 minutes to manufacture the first unit of a new model, then the second unit will take 100 x 0.9 = 90 minutes *on average* to manufacture. However, there can be variability in the actual time it takes to manufacture each unit, so it is not a guarantee that the second unit will take exactly 90 minutes.

The Cumulative Average-Time Learning Model with a 90% Learning Curve