How To Find Average Of 2 Numbers

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If you lot have a list of numbers, or a set, you tin utilise the numbers to find an average, which is a cardinal point in the group. In everyday life, you lot might need to calculate an average to estimate your monthly expenses, find out about how much fourth dimension it commonly takes to accomplish a task, or make up one's mind the rough size of a crowd based on previous attendance.

one

Detect the sum of the numbers in the set. The first thing you need to exercise is to add up all of the numbers in the set.^[i] Let's say you're working the post-obit fix of numbers: 1, 2, 3, and 6. $i+2+3+half-dozen=12$ .^[2]
2

Divide the result by the amount of numbers in the set. There are iv distinct numbers in the set. So, take the sum of the numbers, 12, and divide it by 4 to get the average.^[iii] $12/4=3$ . The boilerplate of the group of numbers is three.^[4]

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1
Write down the average of each category. Use the method of finding the average -- adding up all of the numbers in the set and dividing the result by the amount of numbers -- to find the average of each category.^[five] Permit's say y'all're trying to find your weighted average for a class and you're working with the following averages and weight categories:^[6]
- Homework average = 93%
- Test average = 88%
- Quiz average = 91 %
ii
Write down the weight category of each boilerplate. Retrieve that the weight categories should add together upward to 100%.^[7] Let'southward say you're working with the following weight categories:
- Homework boilerplate = xxx % of terminal grade
- Examination average = fifty % of concluding course
- Quiz average = 20 % of final grade
three

Multiply each average by its weight category. At present, but convert each weight category into a decimal and and then multiply it by the average information technology represents. 30% is actually .3, or 3/x of the terminal grade, l% is really .5, or 1/2 of the total grade, and 20% is actually .two, or 2/10 of the final form.^[viii] Now, multiply these decimal-converted weight categories by the averages they represent.^[9]
4

Add the results. To detect the final weighted average, merely add up the three results. $27.ix+44+18.2=ninety.one$ . The concluding weighted average of the three groups of numbers is $xc.1$ .^[ten]

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Question

The average of 4 numbers is 56. If the average of 3 of the numbers is 52, what is the 4th number?

The sum of the four numbers is 4 10 56. The sum of the three numbers is 3 x 52. The difference between the those ii sums is the quaternary number.
Question

If the average age of three brothers is 15, and two brothers are 15 and 12, how exercise I find the age of the third brother?

xv times 3 equals 45, 12 plus 15 equals 27, 45 minus 27 equals eighteen. The third brother'due south historic period is xviii. Check: fifteen plus 12 equals 27, 27 plus xviii equals 45, and 45 divided by 3 equals 15.
Question

How do I notice the average of 4kg, 240g, and 167g?

To find the boilerplate, add all of the numbers in the set. In your case, 4000, because 1kg+1000g, 4000+240+167 = 4407. Then, because in that location are three numbers, divide by 3 4407/3 = 1469.
Question

If the boilerplate of 4 numbers is 72, and two of the numbers are 68 and 70, how do I find the boilerplate of the remaining numbers?

First detect the total of the four numbers (72 x 4 = 288). Then discover the total of the two numbers that are given to y'all (68 + seventy = 138). Then find the total of the two unknown numbers (288 - 138 = 150). Divide that number by 2 to find the average of the 2 unknowns: 150 / 2 = 75.
Question

How practise I observe the hateful?

In mathematics, "mean" and "average" are the aforementioned matter.
Question

If the boilerplate height of four flowers is 25 cm, and three of them average 20 cm tall, how tall is the quaternary flower?

Permit x equal the he meridian of the fourth bloom. For purposes of this solution, you can presume that the height of each of the other flowers is 20 (because their average is 20). So (20 + 20 + 20 + x) ÷ four = 25, or (60 + x) ÷ 4 = 25. Multiply both sides of the equation by 4: 60 + 10 = 100, which means 4 = 40.
Question

The average age of 20 people was 35. A 55-twelvemonth-old man was replaced by a 35-year-former man. What is the new boilerplate?

In the original group the total age was 20 x 35 = 700 years. The full age of the new grouping is 700 - 20 = 680 years, because the new fellow member is 20 years younger than the former member. For the average age of the new group, divide 680 by 20 to get 34.
Question

If I have an average of unknown numbers and a new number, how do I calculate the new average? e.g. boilerplate of Z numbers is 52 and new number is 55, new average is (52 x Z + 55) / (Z + ane) = ?

That formula is correct. Bold you know Z, that formula will permit y'all calculate the new average.
Question

If 5 girls have an boilerplate of 10p, what is the total?

The total is 5 ten 10p, or 50p.
Question

What are the five numbers with the median of 32 and the hateful of 54?

Will Massey

Community Reply

xxx,31,32,33,144. You accept to satisfy the middle number is 32 and other four (ii either side) sum to 238. Any 4 numbers that do this will work.

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Article Summary X

To determine an average, first add together all the numbers in the set. For example, if your prepare is ane, 2, three, and 4, you lot would add all of those numbers together to get 10. Next, count how many numbers are in the set - in this case, iv. Divide your sum by the amount of numbers in the prepare. The result is your answer. Go on reading the article if you want to larn how to find a weighted boilerplate!

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