Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.

# a random sample of 77 light bulbs had a mean life of 492 hours with a standard deviation of 34 hours; construct 90 percent confidence interval for

a random sample of 77 light bulbs had a mean life of 492 hours with a standard deviation of 34 hours; construct 90 percent confidence interval for the mean life of 77 light bulbs