Calculate Average: Finding Mean When 10 Numbers Sum to 5

Mean Calculation with Given Sum

What is the average of ten numbers that have a sum of 5?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the average of the numbers
00:02 To calculate the average, we sum and divide by the number of occurrences
00:05 We already have the sum, so we'll substitute and divide by the quantity of numbers
00:08 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What is the average of ten numbers that have a sum of 5?

2

Step-by-step solution

To solve this problem, we'll apply the formula for the average:

  • Step 1: The total number of numbers is 10 10 .
  • Step 2: The sum of all these numbers is 5 5 .
  • Step 3: Use the average formula to find the average.

Now, using the formula, the average is calculated as:
Average=Sum of all numbersNumber of numbers=510=12 \text{Average} = \frac{\text{Sum of all numbers}}{\text{Number of numbers}} = \frac{5}{10} = \frac{1}{2}

Therefore, the solution to the problem is 12 \frac{1}{2} .

3

Final Answer

12 \frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Formula: Average equals sum divided by number of values
  • Technique: Divide total sum 5 by count 10 to get 510 \frac{5}{10}
  • Check: Multiply answer by count: 12×10=5 \frac{1}{2} \times 10 = 5

Common Mistakes

Avoid these frequent errors
  • Confusing sum and average positions in formula
    Don't divide number of values by sum = 105=2 \frac{10}{5} = 2 ! This reverses the formula and gives a completely wrong result. Always remember: Average = Sum ÷ Count, so divide the sum by the number of values.

Practice Quiz

Test your knowledge with interactive questions

Calculate the average of \( 10 \) and \( 12 \).

FAQ

Everything you need to know about this question

Why is the average smaller than some of the individual numbers might be?

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The average 12 \frac{1}{2} represents the balance point of all ten numbers. Since their total is only 5, some numbers could be larger than 12 \frac{1}{2} , but others must be smaller (or even negative) to keep the sum at 5.

Can I simplify the fraction 510 \frac{5}{10} ?

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Yes! Both 5 and 10 are divisible by 5, so 510=12 \frac{5}{10} = \frac{1}{2} . Always simplify fractions to their lowest terms for the clearest answer.

What if the sum was 0 instead of 5?

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If ten numbers sum to 0, their average would be 010=0 \frac{0}{10} = 0 . This means the positive and negative numbers in the set perfectly cancel each other out!

Do all ten numbers have to be the same?

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No! The numbers can be completely different. For example: 2, 1, 0, 0, 0, 0, 0, 0, 1, 1 also sum to 5, giving the same average of 12 \frac{1}{2} .

How do I remember the average formula?

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Think of it as sharing equally: If you have 5 cookies to share among 10 people, each person gets 510=12 \frac{5}{10} = \frac{1}{2} of a cookie. Sum ÷ Count = Average!

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