## Key Concepts

Review core concepts you need to learn to master this subject

### Mean of a Dataset

The mean, or average, of a dataset is calculated by adding all the values in the dataset and then dividing by the number of values in the set.

For example, for the dataset [1,2,3], the mean is 1+2+3 / 3 = 2.

Mean in R
Lesson 1 of 3
1. 1
Finding the center of a dataset is one of the most common ways to summarize statistical findings. Often, people communicate the center of data using words like, on average, usually, or often….
2. 2
The mean, often referred to as the average, is a way to measure the center of a dataset. The average of a set is calculated using a two-step process: 1. Add all of the observations in your da…
3. 3
While you’ve shown that you can calculate the average yourself, it becomes time-consuming as the size of your dataset increases — imagine adding all of the numbers in a dataset with 10,000 ob…
4. 4
In this lesson, you learned how to calculate the average of a dataset using the formula: \bar{x} = \frac{x_1 + x_2 … + x_{n}}{n} and the R function: mean(my_data) — Circling back to the ori…

## What you'll create

Portfolio projects that showcase your new skills

## How you'll master it

Stress-test your knowledge with quizzes that help commit syntax to memory