Manufacturing of an extended life light bulb claims

Reference no: EM13338419

The manufacturing of an extended life lightbulb claims thebulb has an average life span of 12,000 hours with a standarddeviation of 500 hours. If thedistribution is bell shaped abdsymmetrical what is the approxiamate percentage of those bulbs that will last

A. between 11,000

b. over 12,500 hours

c. less than 11,000 hours

d. between 11,500 and 13,000 hours

Reference no: EM13338419

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