In: Statistics and Probability
A call center randomly selects and records customer calls. Call handling times in minutes for 20 calls are as follows: 6, 26, 8, 2, 6, 3, 10, 14, 4, 5, 3, 17, 9, 8, 9, 5, 3, 28, 21, and 4. Please calculate the 10th quartile, 90th quartile, median, Q1, Q3, sample mean, and sample standard deviation of call handling times.