Mean
The mean is the average of the numbers: a calculated "central" value of a set of numbers. To calculate: Just add up all the numbers, then divide by how many numbers there are.
Summary
The mean is the average of the numbers: a calculated "central" value of a set of numbers. To calculate: Just add up all the numbers, then divide by how many numbers there are.
Things to Remember
- The mean is the sum divided by the count.
- The mean is the average of the numbers.
- The mean isn't a value from thye original list.
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Subjective Questions
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Mean
Mean
The mean is the average of all numbers and this is also called arithmetic mean. Mean can be calculated by adding all of the numbers in a set and then dividing the total count of numbers. For example, the mean of the numbers 2, 3, 7 is 4 therefore, 2+3+7=12 and 12 divided by 3 (there are three numbers) and the answer is 4.
To find the mean of a set of n number, x1, x2, x3........xn add the numbers in the set and divide the sum by n.
Mean (x) = \(\frac{x_1+x_2+x_3+......+x_n}{n}\)
= \(\frac{∑x}{n}\)
The greek letters ∑(called sigma) represents the sum of the numbers.
Example:
Find the mean of 2, 7 and 9
Add the numbers: 2 + 7 + 9 = 18
Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6
So, the mean is 6
Lesson
Statistics
Subject
Compulsory Maths
Grade
Grade 8
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