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There is a large supply of special energy saving light bulbs with the average life of 890 hours and a standard deviation of 50 hours.

There is a large supply of special energy saving light bulbs with the average life of 890 hours and a standard deviation of 50 hours. A random sample of 49 light bulbs is drawn. a) Calculate the standard error of the mean. b) Find the probability that the sample mean will be less than 1000 hours. Assume that the lives of the light bulbs are normally distributed

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