0.45 will be the mean number of defects per batch.
Given,
The number of batches of batteries manufactured by a company = 15
The rate of defects in the batteries = 3%
We have to find the mean number of defects per batch;
Defects per Unit (DPU)
The average number of defects per unit of a product is measured by DPU. It can be calculated by dividing the overall number of flaws by the quantity of units. For instance, the DPU is equal to 2 if 30 units are created and a total of 60 flaws are discovered.
Here,
The mean number of defects per batch = Number of batches × Rate of defects
Mean number of defects = 15 × 3/100 = 0.45
That is,
The mean number of defects per batch is 0.45
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