Question 6.379

34. Facebook Friends. Statistica.com reported in 2014 that the mean number of Facebook friends for 18- to 24-year-olds is 649. Assume the distribution is normal with and standard deviation . Find the probability that a randomly selected Facebook user has the following number of friends:

  1. Fewer than 424 friends.
  2. More than 949 friends.
  3. Between 424 and 949 friends.
  4. Find the number of Facebook friends that represents the 75th percentile.
  5. One particular Facebook user has 1174 friends. Is this unusual? On what do you base your answer?