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".

Z-scores are standardized values that can be used to compare scores in different distributions.

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?

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