Ijust need someone to let me know if i am correct here. the length of an instant message conversation is normally distributed with a mean of 5 minutes and a standard deviation of .7 minutes. what is the probability that a conversation lasts longer than 6 minutes? 0.045 0.077 0.955 this is than answer i chose. 0.922 a study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 30 hours. the population standard deviation is 2 hours. what is the 95% confidence interval for the mean? 29.76−30.24 hours 29.88−30 hours 30−30.12 hours 29.88−30.12 hours this is the answer that i chose.