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A quality control engineer claimed that the mean life of a new brand of light bulbs is at least 1000 h. A sample of 100

A quality control engineer claimed that the mean life of a new brand of light bulbs is at least 1000 h. A sample of 100 light bulbs is taken, and the sample mean life of these light bulbs is found to be 975 h. with a standard deviation of 100 h. Test the engineers claim at the 5 % level of significance.

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