A. Reject H0. The mean service life of the bulbs is less than the expectation. B. Do not reject H0. The mean service life of the bulbs is less than the expectation. C. Reject H0. The mean service life of the bulbs is not less than the expectation D. Do not reject H0. The mean service life of the bulbs is not less than the expectation E. none of the above.
The mean service life
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