Arithmetic mean
Mean nikalne ke liye total ko values ki tadaad se divide karein. Missing value, badalte group aur barabar faaslay wali list ka mean samjhein; alag group sizes hon to averages ko seedha na jorein.
core level
Preparation level describes the foundations needed to study this topic. It is editorial guidance, not a difficulty score.
What this Topic covers
Arithmetic mean of a finite nonempty list or count-based frequency table with comparable units: sum/count meaning, recovery of totals or missing values, changes after adding/removing/replacing observations, combined groups with count weights, and means of complete equally spaced lists such as consecutive integers or multiples within stated bounds. Includes recognising endpoint conditions, uneven spacing, missing counts, outlier influence and the distinction between mean, median and mode. Excludes detailed median/mode algorithms, grouped continuous-data estimates, dispersion, probability, inference, geometric/harmonic means, and average speed over unequal distances; these introduce independent statistical or rate models.