4. The followings data shows the information of serving time (in minutes) for 40 customers in a post office: 2.0 4.5 2.5 2.9 4.2 2.9 3.5 2.8 3.2 2.9 4.0 3.0 3.8 2.5 2.3 3.5 2.1 3.1 3.6 4.3 4.7 2.6 4.1 3.1 4.6 2.8 5.1 2.7 2.6 4.4 3.5 3.0 2.7 3.9 2.9 2.9 2.5 3.7 3.3 2.4 QQS1013 Elementary Statistics Chapter 2: Descriptive Statistics 44 a. Construct a frequency distribution table with 0.5 of class width. b. Construct a histogram. c. Calculate the mode and median of the data. d. Find the mean of serving time. e. Determine the skewness of the data. f. Find the first and third quartile value of the data. g. Determine the value of interquartile range.