"The daily amount of time people spend on social media is normally distributed with mean u = 145 minutes and standard deviation of o = 20 minutes. A - er . If we select a social media user at random, what is the probability that this person spends less than 90 minutes on social media in a day? : If we select 100 social media users at random and record the daily amount of time they spend on social media, what is the probability that their sample mean exceeds 148 minutes