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A quality-control engineer samples 250 light bulbs from a warehouse. A successful bulb lasts at least 500 hours. Of the 250 sampled, 185 were successful.

A quality-control engineer samples 250 light bulbs from a warehouse. A "successful" bulb lasts at least 500 hours. Of the 250 sampled, 185 were "successful". In reality, 75% of the bulbs in the warehouse will last that long. Compute the standard error of the sample proportion , the proportion of light bulbs that will be successful

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