Math - presentation of data

1. Topic: Processing and Presenting Data
Grade: 8
Subject: Mathematics

2. Types of statistical measures used

3. Types of statistical measures used

4. Types of statistical measures used

5. Selecting Statistics
We use averages to give meaning to the raw data and helps us make some conclusions
about it. We can also select the most appropriate measure of statistical calculation to
our problem.

6. Properties of Mean

9. Advantages of Median

10. Disadvantages of Median

11. Exercise 12.1
Mean= sum of all values / total packets Mean= 3008/15=200.5
Median= middle value = (15 + 1)/2= 8th value after arranging in order=
200
Mode = Most often = 200

12. Exercise 12.1
Mean= sum of all values / total
competitions
Mean= 43.84/9 =4.87
Median= middle value = (9 + 1)/2= 5th value after arranging in order=
5.34
Mode = Most often = 4.24

13. Mean for farmer B= sum of all values / total
cucumbers
Mean for B = 302/12 = 25.16
Exercise 12.1
Mean for farmer A= sum of all values / total
cucumbers
Mean for A= 349/12 = 29.08

14. Median for Farmer B = middle value = 6th + 7th /2 = 29+30/2= 26
Exercise 12.1
Median for Farmer A = middle value = 6th + 7th /2 = 29+30/2=29.2
Mode for Farmer A = Most often = 31
Mode for Farmer B = Most often = 26
According to all the averages the average length of cucumbers is more
than 25 cm . But farmer A is more likely to sell his cucumbers as his
cucumbers are of a consistent length . That is they donot have a large
range.

15. Thank You