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The lifespan of an Xray tube used as part of an Xray imaging machine follows a normal distribution with a mean of 6.25 years and

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The lifespan of an Xray tube used as part of an Xray imaging machine follows a normal distribution with a mean of 6.25 years and a standard deviation of 1.7 years. Standard Normal Distribution Table a. Calculate the probability that a randomly-selected Xray tube will have a lifespan of: (i) Less than 3 years P(X

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