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View Policies Current Attempt in Progress The lamps of type A have the average lifetime of 2500 hours with the variance of 4000. The lamps

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View Policies Current Attempt in Progress The lamps of type A have the average lifetime of 2500 hours with the variance of 4000. The lamps of type B have the average lifetime of 2600 hours with the same variance. A random sample of / = 100 lamps of each type is selected. Let X and X be the two sample means. Find the probability that XB - XA

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