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The length of time it takes passengers to get through the security checks at a large urban airport follows a normal distribution with a mean

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The length of time it takes passengers to get through the security checks at a large urban airport follows a normal distribution with a mean of 22.6 minutes and a standard deviation of 7.4 minutes. Using a z-score to standardize the given values, find the probability that a passenger will take longer than 20 minutes to get through the security check

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