In your study of statistical reasoning, you have probably come across the concept of standard deviation.  Let’s take a closer look to see what this really means.

Standard Deviation Problems Without Z-Scores

After this lesson, you might want to proceed further and investigate the lesson on problems without using z-scores.

https://mathpqjq.com/standard-deviation-problems-no-z-scores/

Standard Deviation Problems With Z-Scores

The natural progression from the previous two lessons would be to now look at problems that require the use of z-scores.

https://mathpqjq.com/z-scores/