1. Unit 10-5 Central Tendency MEAN, MEDIAN, MODE, RANGE

2. Vocabulary—Central tendency Mean Median Mode Range

3. How to find these values using the example: Grades in a gradebook are 90, 88, 73, 81, 80, 81, 75, 52, 81, 90 Mean = Median = Mode = Range =

4. Central Tendency Example 1 The salaries of several people in a company are listed. Which measure will best represent this data? (Mean, Median, Mode) President$234,560 Vice-President$156,090 Manager$ 95,000 Clerk – 1$ 30,000 Clerk – 2 $ 27,000 Warehouse mgr$ 22,000 Warehouse clerk$ 21,500 Secretary $ 18,000 Service Rep$ 17,500 Service Asst.$ 16,000

5. Central Tendency Example 2 The times for the 8 girls in the final of the 100 meter hurdles race at a track meet are listed below (according to the lanes they ran in). Is the mean a good representation of this data? Explain. Lane 116.33 sec Lane 216.38 sec Lane 315.88 sec Lane 415.59 sec Lane 521.45 sec Lane 6 16.47 sec Lane 716.72 sec Lane 816.74 sec

6. Central Tendency Example 3 During the first week of February in a northern city, the daily high temperatures are listed below. Find the mean, median, mode and range for these temperatures. Which measure is the best representation of this data? Day 132 o Day 210 o Day 314 o Day 418 o Day 522 o Day 610 o Day 7 30 o

7. Central Tendency Example 4 Visitor counts for a small museum during the first 7 days of the last month are shown below. The museum is open 7 days per week. A staff member analyzing the attendance records states that the median number of daily visitors was 35. Does this accurately depict this data? Tuesday35 Wednesday22 Thursday31 Friday 40 Saturday262 Sunday170 Monday12

8. Central Tendency Example 5 Grant has kept a record of his test grades in math for the entire school year. Find the mean, median, mode, and range for Grant’s test grades. Unit 1 Test82 Unit 2 Test86 Unit 3 Test71 Unit 4 Test82 Unit 5 Test62 Unit 6 Test78 Unit 7 Test82 Unit 8 Test64 Unit 9 Test71 Unit 10 Test80