statistics

There already are three courses on statistics:

• Math By Subject --> Statistics and probability (https://www.khanacademy.org/math/statistics-probability)

• AP Statistics (Click on "Math By Subject" first, then it's underneath "High school statistics") (https://www.khanacademy.org/math/ap-statistics)

• Math By Grade --> High School --> High school statistics (https://www.khanacademy.org/math/math-1-2-3/probability)

 All three courses teach the concepts you described!