Topic Details (Notes format)

How to Calculate the Mean (Average)

Subject: Mathematics

Book: Maths Mastery

Calculating the mean is a cornerstone of data analysis, letting you gauge the central tendency of a set of numbers. The formula is straightforward: Mean = (Sum of All Values) ÷ (Number of Values). For instance, if you have monthly sales figures like [120, 150, 130, 100], the sum is 500 and there are 4 values, so the mean is 500 ÷ 4 = 125. Means are used in classroom grading, budgeting, and countless scientific analyses. Developing a strong intuitive feel for what the mean signifies helps interpret test scores, plan resource allocations, and evaluate trends in everyday life.

Practice Questions

What is the area of an equilateral triangle with side length 10 cm?

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If x:y = 2:3 and z:y = 4:3, what is x:z?

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A car covers a distance of 150 km in 2.5 hours. What is its average speed?

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If the ratio of two numbers is 3:5 and their HCF is 4, what are the numbers?

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If sin(A) = 1/2 and A is acute, what is the value of A?

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The area of an equilateral triangle with side length 6 cm is:

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The LCM of 12 and 15 is:

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If the average of five consecutive odd numbers is 25, what is the largest number?

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What is the sum of all even numbers between 1 and 50?

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The probability of getting an even number when rolling a die is:

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