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Suppose A Company Claims That Its Light Bulbs Last An Average Of A Thousand Hours. Given A Sample Of 500 Light Bulbs, The Average Bulb In The Sample Lasts 950 Hours And The Sample Standard Deviation Is 100 Hours. What Is The Probability Of Observing A Sample Mean That Small ? - Math Discussion

Suppose a company claims that its light bulbs last an average of a thousand hours. Given a sample of 500 light bulbs, the average bulb in the sample lasts 950 hours and the sample standard deviation is 100 hours. What is the probability of observing a sample mean that small ?