1. Make a frequency table for the number of songs on a collection of CDs. 10 11 13 8 12 11 9 15 12 11 13 15 14 Displaying Frequency COURSE 3 LESSON 10-1 No. of SongsTally Frequency 81 91 101 113 122 132 141 152 Make a tally mark for each CD. The number of tally marks in each row is the frequency. 10-1

2. Make a line plot for the data given. 10 11 13 8 12 11 9 15 12 11 13 15 14 Displaying Frequency COURSE 3 LESSON 10-1 Each represents one CD. The data are from 8 to 15. 10-1

3. Find the mean, median, and mode of the data in the line plot. Displaying Frequency COURSE 3 LESSON 10-1 Mean (1 8) + (1 9) + (1 10) + (3 11) + (2 12) + (2 13) + (1 14) + (2 15) 1 + 1 + 1 + 3 + 2 + 2 + 1 + 2 Multiply each data value by its frequency. Add the frequency of each item to find the total number of items. 10-1

4. (continued) Displaying Frequency COURSE 3 LESSON 10-1 11.8 Round to the nearest tenth. = 154 13 Simplify. Median There are 13 data items. Since the data are ordered, the median is the seventh item, which is 12. Mode The mode is the item that occurs most often, which is 11. 10-1