Mathematics, 13.07.2020 16:01 Calebmf9195

A new lightbulb has been developed with a mean lifetime of 1800 hours and standard deviation of 100 hours. A sample of 100 of these bulbs is tested. The sample mean lifetime is 1770 hours. (a) What is the probability of obtaining a sample mean that is less than or equal to 1770 hours? (5 points) (b) Would it be unusual to obtain a sample mean of less than or equal to 1770 hours? (5 pts

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A new lightbulb has been developed with a mean lifetime of 1800 hours and standard deviation of 100...