Descriptive statistics

Mean, median, mode, range, variance, standard deviation and frequency tables

The Descriptive statistics unit belongs to the Statistics section of Math Mental and has 22 lessons: mean, median, mode, range, variance, standard deviation and frequency tables.

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Sample questions

In the lesson, numbers change every session and the solution appears after you answer.

$\bar{x}:\; 4, 7, 9, 12$
Step by step
1. $\displaystyle \frac{4 + 7 + 9 + 12}{4} = \frac{32}{4}$
Answer $8$
$\operatorname{Md}:\; 3, 8, 5, 10, 6, 9$
Step by step
1. $\displaystyle 3, 5, 6, 8, 9, 10$
2. $\displaystyle \frac{6 + 8}{2}$
Answer $7$
$\sigma^2:\; 2, 4, 6$
Step by step
1. $\displaystyle \bar{x} = 4$
2. $\displaystyle \frac{4 + 0 + 4}{3}$
Answer $\frac{8}{3}$

Lessons in this unit

Arithmetic mean Lesson, 8 questions
Means with decimals Lesson, 8 questions
Weighted mean: grades Lesson, 8 questions
Weighted mean: prices Lesson, 8 questions
Median: odd count Lesson, 8 questions
Median: even count Lesson, 8 questions
Mode Lesson, 8 questions
Range Lesson, 8 questions
Temperature range Lesson, 8 questions
Practice: mean, median and mode Practice, 12 questions
Variance Lesson, 6 questions
Variance with larger data Lesson, 6 questions
Exact standard deviation Lesson, 6 questions
Rounded standard deviation Lesson, 6 questions
Absolute and cumulative frequency Lesson, 8 questions
Relative frequency Lesson, 8 questions
Mean from a table Lesson, 8 questions
Median from a table Lesson, 8 questions
Effect of changing a value Lesson, 8 questions
Problems: target mean Lesson, 8 questions
Review: descriptive statistics Practice, 12 questions
Unit test 15 questions

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Sample questions

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Lessons in this unit

Your first lesson takes five minutes