A Lightbulb Manufacturing Plant's Production Line Has Determined That the Probability

A lightbulb manufacturing plant's production line has determined that the probability a lightbulb will be defective is 0.04. The quality control team decides to take a random sample of 500 lightbulbs and measure the proportion of those lightbulbs that are defective.
-On average, how far away should the quality control team expect the sample proportion of defective lightbulbs to be from 0.04?

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