 # Statistics Lectures - 7 (Z-Scores)

A series of free Statistics Lectures with examples & solutions in videos.

These lectures cover the concept and use of z-scores.

This is the seventh page of the series of free video lessons, "Statistics Lectures".

### Statistics - Lecture 18

Z-Scores (part one)

### Statistics - Lecture 19

Z-Scores (part two)
Z-scores are standardized values that can be used to compare scores in different distributions.

### Statistics - Lecture 20

Extra Z-Score Problems
Example:
In the United States, the average IQ is 100, with a standard deviation of 15.
What percentage of the population would you expect to have an IQ lower than 85?
What percentage of the population would you expect to have an IQ between 90 1nd 120?

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. 