In this question the standard deviation is 8.6 minutes

Question 4: The average US adult spends 38 minutes per day on Facebook. If the time they spend on Facebook follows a normal distribution and the standard deviation is 8.6 minutes, what is the probability that a particular user will spend - a. More than 60 minutes per day on Facebook. [1 Mark] b. Less than 10 minutes per day on Facebook. [1 Mark] C. Between 20 and 30 minutes per day on Facebook. [1 Mark] Question 5: Accord