A company manufacturing electric bulbs claims that the average life of bulbs is 1200 hours. A random sample of 100 bulbs shows the average life is 1180 hours. The standard deviation of the life of bulbs is known to be l50 hours. Test the company’s claim at 5% l.o.s.
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Company claims average life of bulbs is 1200 hours
A random sample of 100 bulbs1200 average life as 1180
Hence number of bulbs left with 1200 hours is
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