Researchers surveyed 30 people about the number of hours they spent per day on social media. The sample mean was 3 hours with a standard deviation of 0.75 hours. Using this information, answer the following questions. a. Calculate the z-score for a value of 5 hours. b. Calculate the z-score for a value of 3.5 hours. c. Calculate the z-score for a value of 2.5 hours. d. Calculate the raw value for a z-score of -1.33. e. Calculate the raw value of a z-score of +2.68