1. Standard Deviation and Variance (Class 2) OBJ: Find range, measures of central tendency, and construct tables and graphs

2. Below are the algebra test scores for a class of 25 students: 56575860616567687071747577 7982878889929596979899

3. Calculator commands: (at the bottom of the second page of notes) STAT, 1 (for EDIT), 50,ENTER (repeat for all data), STAT,  (for CALC), 1 (for 1-VAR STAT), ENTER (To clear data,▲L1, CLEAR, ENTER) 2ND STAT (for LIST),  (for MATH), 8, (for VARIANCE), 2ND 1 (for L1)

4. Give the mean, median, and mode Mean 78.4 Median 77 Mode 99

5. Give the standard deviation and variance Standard deviation 14.8 Variance 218.1

6. Below are the algebra test scores for a class of 25 students: 50646870 727375 7678 79 808182 8588 89909293

7. Below are the algebra test scores for a class of 25 students: 56575860616567687071747577 7982878889929596979899

8. Give the mean, median, and mode. Give the standard deviation and variance Class 1 Class 2 Mean 78.4 Median 79 Mode 82 Standard deviation 9.8 Variance 95.2 Mean 78.4 Median 77 Mode 99 Standard deviation 14.8 Variance 218.1

9. Give range and class width Range 99-56 43 Class Width 43 6 7 1/6 → 8

10. Construct a frequency table and a cumulative frequency table with 6 classes 5656 5757 5858 6060 6161 6565 6767 6868 7070 7171 7474 75757 7979 8282 87878 8989 9292 9595 9696 9797 989899 Class Relative Frequency

11. Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency Class Relative Frequency 56-635 64-715 72-794 80-872 88-954 96-1035

12. Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency 56-635 64-715 72-794 80-872 88-954 96-1035 CumulativeFrequency Class < 56 # % 0

13. Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency 56-635 64-715 72-794 80-872 88-954 96-1035 Cumulative Class Frequency # % < 560 0 % < 645 20 % < 7210 40 % <8014 56 % < 8816 64 % < 9620 80 % < 10425 100%

14. Construct a histogram. Clearly mark axes. F r e q u e n c y Test Scores ClassRelative Frequency 56-635 64-715 72-794 80-872 88-954 96-1035 25

15. Go to frequency polygon at the top of the next page of notes. Give all class marks. 56 + 63 2 59.5 64 + 71 2 67.5 59.5 67.5 75.5 83.5 91.5 99.5

16. Construct a frequency polygon, mark axes F r e q u e n c y Test Scores Class Mark 51.5 Relative Frequency 59.55 67.55 75.54 83.52 91.54 99.55 107.525

17. Construct an ogive. Clearly mark both axes R C F e u r l m e a u q t l u i a e v t n e i c v y e Test Scores Cumulative Class Frequency # % < 560 0 % < 645 20 % < 7210 40 % <8014 56 % < 8816 64 % < 9620 80 % < 10425 100%