0✅ Data:
Information collected in numbers (e.g., marks of students, temperature readings).
✅ Measures of Central Tendency:
-
Mean (Average):
Mean=Sum of observations Divided by Number of observations -
Median: Middle value (when data is arranged in order)
-
Mode: Most frequent value
Example:
Data: Marks obtained by 10 students in Math:
45, 50, 50, 60, 55, 50, 70, 65, 60, 50
Mean:
Mean=(45+50+50+60+55+50+70+65+60+50) /10 = 555/10 = 55.5
Median (after sorting):
45, 50, 50, 50, 50, 55, 60, 60, 65, 70
Middle two numbers: 50 and 55 →
Median=(50+55)/2=52.5
Mode: 50 (appears 4 times)
