Section 2.2 Frequency Distributions and Their Graphs 57 2 4 6 8 10 12 14 16 18 20 0.25 0.20 0.15 0.10 0.05 0 Relative Frequency Figure 2.11 A bimodal histogram Check Your Understanding 3. Classify each of the following histograms as skewed to the left, skewed to the right, or approximately symmetric. 0 4 8 121620 24 2832 3640 a. 5000 4000 3000 2000 1000 0 Frequency 1 2 3 4 5 6 7 8 9 101112 0.30 0.25 0.20 0.15 0.10 0.05 0 b. Relative Frequency 2 4 6 8 1012 1416 1820 222426 250 200 150 100 50 0 c. Frequency 4. Classify each of the following histograms as unimodal or bimodal. 0 1 2 3 4 5 6 7 8 9 1011 0.30 0.25 0.20 0.15 0.10 0.05 0 a. Relative Frequency 3 6 9 12 15 18 21 24 27 30 33 25 20 15 10 5 0 b. Frequency 1 3 5 7 9 11 13 15 17 19 21 0.25 0.20 0.15 0.10 0.05 0 c. Relative Frequency Answers are on page 63. USING TECHNOLOGY We use the data in Table 2.7 to illustrate the technology steps. TI-84 PLUS Entering Data Step 1. We will enter the data into L1 in the data editor. First, to clear out any data that may be in the list, press STAT, then 4: ClrList, then enter L1 by pressing 2nd, L1 (Figure A). Then press ENTER. Step 2. Enter the data into L1 in the data editor by pressing STAT then 1: Edit. For the data in Table 2.7, we begin with 1.5, .87, 1.12, 1.25, 3.46, ... (Figure B). Figure A Figure B
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