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 \( 11 \) and \( 7 \).

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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