MA 3000-according to a social media blog, time spent on a certain social

Question
according to a social media blog, time spent on a certain social networking website has a mean of 20 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed adn that the standard deviation is 7 minutes. If you select a random sample of 25 sessions what is the probability that the sample mean is between 19 and 20?

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