The number of items that are expected to be defective is; 1
We are told that on average that 0.026% of the items from a certain factory are defective.
Now, if 4000 items are checked, the number of defective items would be gotten by multiplying the percentage of defective items by the number of items checked.
Thus;
Number of defective items = 0.026% * 4000 = 1.04 approximately 1
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