CBSE · Class 6-12

Class 11 · Mathematics (041)

Unit 13 · Class 11Mathematics (041)

Statistics and Probability

Statistics

Measures of dispersion: range, mean deviation, variance, and standard deviation.

Lessons

3 concepts

1
Range & Mean Deviation
Range = max $-$ min. Mean deviation about mean $= \dfrac{\sum |x_i - \bar x|}{n}$ .
2
Variance & Standard Deviation
Variance $\sigma^2 = \dfrac{\sum (x_i - \bar x)^2}{n}$ ; SD $= \sqrt{\sigma^2}$ .
3
Coefficient of Variation
CV $= \dfrac{\sigma}{\bar x} \times 100$ . Series with lower CV is more consistent.

Skills to practise

Skill · medium

Statistics — Practice (coming soon)

Practice bank for this unit is in progress. You can still read the lessons above.