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GIL internet services record customer usage patterns. Historically they have found the duration of an internet session is normally distributed with a variance of 550.2

GIL internet services record customer usage patterns. Historically they have found the duration of an internet session is normally distributed with a variance of 550.2 minutes2. What is the probability of a randomly selected internet session being more than half an hour either side of the mean internet session duration?(4 decimal places)

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