Statistics
Important formulas for Class 9 statistics are listed below:
| Measure of Central Tendency | |
| Mean | Sum of Observation/Total number of observation = ∑ x/n |
| Median | [(n+1)/2]th term [For odd number of observation] Mean of (n/2)th term and (n/2+1)th term [For even number of observation] |
| Mode | Value which is repeated maximum time in a data set |