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What is the approximate percentage of bulbs

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Reference no: EM132848555

The manufacturer of an extended-life lightbulb claims the bulb has an average life of 13,000 hours with a standard deviation of 1,000 hours. If the distribution is normal, what is the approximate percentage of these bulbs that will last

A. Between 11,000 and 15,000

B. Between 8,000 and 21,000

Reference no: EM132848555

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