# Lesson Plan: Standard Deviation of a Data Set Mathematics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to find and interpret the standard deviation from a given data set.

#### Objectives

Students will be able to

• understand what a measure of dispersion means and recall the formula for the standard deviation,
• calculate the standard deviation from a list of data,
• calculate the standard deviation from a frequency table,
• calculate the standard deviation from a grouped frequency table,
• use the measure of dispersion to make judgements about data.

#### Prerequisites

Students should already be familiar with

• the mean and range of a data set,
• methods for collecting and displaying data such as frequency tables,
• summation notation.

#### Exclusions

Students will not cover

• variance of a data set,
• the standard deviation or variance of discrete or continuous random variables,
• calculating sample variance or sample standard deviation.