AlgèbreFacile
Math Learning PlatformIntroduction to Statistics
📖 About this lesson
Learn to collect, organize and interpret data
Introduction to Statistics
Statistics allow us to ,[object Object],.
Basic vocabulary
- •[object Object],: the entire group studied
- •[object Object],: a subset of the population
- •[object Object],: observed values
- •[object Object],: proportion = count / total count
Frequency table
📝 Example
Example: Scores of 10 students
| Score | Count | Frequency | |-------|-------|-----------| | 60 | 2 | 20% | | 70 | 3 | 30% | | 80 | 4 | 40% | | 90 | 1 | 10% |
Measures of central tendency
Mean
Sum of all values ÷ number of values
[object Object],: 60+60+70+70+70+80+80+80+80+90 = 740 ÷ 10 = ,[object Object]
Median
Middle value when data is ordered
[object Object],: (70 + 80) ÷ 2 = ,[object Object]
Mode
Most frequent value = ,[object Object]
💡 Tip
- •Mean: sensitive to extreme values
- •Median: resistant to extremes
- •Mode: useful for non-numerical data
Example 1
Find the mean of: 5, 8, 6, 9, 7
7
Sum = 5+8+6+9+7 = 35. Mean = 35 ÷ 5 = 7
Example 2
Find the median of: 3, 7, 2, 9, 5
5
Order: 2, 3, 5, 7, 9. The middle value is 5.
Ready to Practice? 💪
4 exercise(s) available for this lesson
Test your knowledge and earn points!