Find the range, the quartiles and the IQR

Text messages sent in a day by a group of students are given below

17 messages, 18 messages, 38 messages, 40 messages, 66 messages, 77 messages

Use the median-of-halves convention: order all observations, retaining repeats. If the number of observations is odd, omit only the middle observation from both halves. Q1 and Q3 are the medians of the lower and upper halves