5. a) What must be true to (what conditions must be met) to use the Central Limit Theorem? b) Among college students, the average daily time on social media is 4.2 hours with a standard deviation of 1.6 hours. What is the probability that mean time for a sample of 40 students in a program is at least 4 hours? c) Is this an unusual event? Explain how you know. 1