1. If Kyle purchased two suits for $179 each and three suits for $189 each, what is the average price Kyle paid for each suit? (A) $183.00 (B) $184.00 (C) $185.00 (D) $185.50 (E) $186.50 7.1-1 If you've learned how to compute weighted averages, you know exactly how to set up this problem: (179)(2) + (189)(3) 5 It's (C), $185.00. If you've learned how to compute weighted averages, you know exactly how to set up this problem: (179)(2) + (189)(3) 5 It's (C), $185.00. Warm-up

2. STATS GAME PLAN Date 2/20/13 Wed CA Standards6.0 Students know definitions of the mean, median, and mode of a distribution of data and can compute each in particular situations. GoalSWBAT create a graphical representation of and analyze numerically student-generated data. Section1.3b Measure of Center – The M&M’s of Stats a)Mean vs. Median b)Changing mean and median HWP26 (14 – 28) AnnouncementBring 3 pennies to class tomorrow Ch.1 Quiz 1 on Friday

3. A class of 25 students took a science test. 10 students had an average (arithmetic mean) score of 80. The other students had an average score of 60. What is the average score of the whole class? Copyright © 2009 Pearson Addison- Wesley Think- Pair- Share. Think- Pair- Share.

4. I DO: Sally receives the following scores on her math tests: 78, 92, 83, 99. What score does she need on the next test in order to have an average of 90 on her trig tests? 7.1-4

5. WE DO: Daniel has four test scores of 86, 81, 80, and 75. There is one more test during the semester. He wants to make at least a B- in the class, which means he needs his average to be an 80. All five tests count the same in determining the class grade. What grade does Daniel need to make on the fifth test to make a B- in the class? Think- Pair- Share. Think- Pair- Share.

6. YOU DO TOGETHER: Suppose Eric has taken three tests and made 88, 90, and 84. Each test counts the same amount. Eric wants to know what he needs to make on the fourth test to have an overall average of 90 so he can make an A in the class. Think- Pair- Share. Think- Pair- Share.

7. YOU DO TOGETHER: Karla has three test scores of 84, 90, and 86. There is one more test during the semester. She wants to make an A in the class, which means she needs her average to be a 90. All four tests count the same (25% each) in determining the class grade. What grade does she need to make on the fourth test to make an A in the class? Think- Pair- Share. Think- Pair- Share.

8. CHALLENGE : Kelly has taken four tests and made 82, 77, 75, and 84. She has to take a final exam and her teacher has told her that the final exam will count as two test grades. Kelly really wants to make a B in the class, which means she needs an overall average of 80. What does Kelly need to make on the final to get a B in the class? Think- Pair- Share. Think- Pair- Share.

9. CHALLENGE Tina receives the following scores on her chemistry tests: {88, 92, 74, x, 94, 85}. a) If x = 80, what is Tina’s average? b) If Tina's average is 83, what is x ? c) If the highest possible score on a test is 100, can Tina get a 90 in the class? a) 85.5 b) x = 65 c) No, she cannot get higher than an 88.8 (she would need a 107 on the fourth test to get a 90). a) 85.5 b) x = 65 c) No, she cannot get higher than an 88.8 (she would need a 107 on the fourth test to get a 90).

10. CHALLENGE: Tiffany has taken three tests and made 92, 77, and 95. She has to take a final exam and her teacher has told her that the final exam will count as two test grades. Tiffany really wants to make an A in the class, which means she needs an overall average of 90. Tiffany is not sure if it is possible to make an A since she made a 77 on one of her tests. Is it possible? If not, explain why. If it is possible, what grade does she need to make? Think- Pair- Share. Think- Pair- Share.

11. The average (arithmetic mean) of 3 numbers is 60. If two of the numbers are 50 and 60, what is the third number? A. 50 B. 55 C. 60 D. 65 E. 70 7.1-11 ANSWER E. 70 3*60=180, which is the total number of points earned; the two numbers we do know are 50 and 60 which add up to 110 The third number is 180-110=70 since all three numbers must add up to 180 ANSWER E. 70 3*60=180, which is the total number of points earned; the two numbers we do know are 50 and 60 which add up to 110 The third number is 180-110=70 since all three numbers must add up to 180 Think- Pair- Share. Think- Pair- Share.

12. Activity: 1)Work in groups of 2 or 3 2)Nominate 1 person to be the dealer 3)Draw 1 card at a time. You deck should contain card values from 1 to 10. 4)Record the values on a separate sheet of paper (everyone in the group must do this task) 5)Repeat the process 50 times (guess what n =?) 6)Construct a graphical representation (dotplot or stemplot?) 7)Calculate/Find mean, mode, median, range 8)Comment on the shape of your graph. Be sure to mention the influence by mean/median.