In a study of sleep quality and academic performance, the daily sleep duration among college students was approximately Normally distributed with mean = 7.13 hours and standard deviation = 1.67 hours. You plan to take an SRS of size n = 60 and compute the average total sleep time. Use the 95 part of the 68-95-99.7 rule to describe the variability of the sampling distribution of the mean. Provide each answer to three decimal places. Lower value: Upper value: hours hours