A laptop company claims up to 9.1 hours of wireless web usage for its newest laptop battery life. However, reviews on this laptop show many complaints about low battery life. A survey on battery life reported by customers shows that it follows a normal distribution with mean of 8.5 hours and standard deviation of 39 minutes. What is the probability that the battery life is at least 9.1 hours? Provide your answer in decimal format with 3 decimal points

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