Finding the mean deviation of numbers is a compulsory step before you can find the variance in statistics.
In this lesson, you will learn the formula and the step-by-step method for finding the mean deviation of numbers.
BONUS: A link to practice questions on statistics is included at the end of this lesson.
Formula for finding the mean deviation of numbers
The formula for finding the mean deviation of numbers is the mean of the numbers minus each of the numbers.
Mean – Number
Question on finding the mean deviation of numbers
Let’s take an example:
Question:
Find the mean deviation of 15 in the following numbers
15, 11, 8, 3, 13, 8, 5
STEP 1.
Find the mean of the numbers
Working
The mean of the numbers:
15, 11, 8, 3, 13, 8, 5
= 9
STEP 2.
Pick out the number given in the question
The question asked us to find the mean deviation of 15
STEP 3.
Transfer your answers in STEP 1 and 2 to the formula
Mean – Number
9 – 15 = -6
Final answer
The mean deviation of 15 in the following numbers:
15, 11, 8, 21, 17, 3, 8
= –6
Do you have something to ADD TO or ASK ON this topic? Comment below and a Teacher or fellow TOPPER will reply you.
Otherwise,
Click the button to practice questions on statistics.
Let others know