Statistics

Board: CBSE Class: 11

Chapter Overview

Measures of central tendency (mean, median, mode) describe data centers. Measures of dispersion (range, variance, standard deviation) describe data spread. The chapter covers these for grouped and ungrouped data. Coefficient of variation compares variability of different data sets.

Topics Covered

Mean, Median, Mode
Measures of Dispersion
Mean Deviation
Variance and Standard Deviation
Coefficient of Variation
Frequency Distributions

Key Formulas

Mean = sum fixi / sum fi

Variance = sum fi(xi - mean)2 / N

Standard deviation = √variance

CV = (stdev/mean) x 100%

Real-World Applications

Applications: Research, business analytics, quality control, economics, and data science.

Study Tips

Tip: Practice with both grouped and ungrouped data

Tip: Understand variance vs standard deviation

Tip: CV is key for comparing datasets