The mean of a set is found by finding the sum of the set and then dividing by the number of items in the set. Given that both of her parents are 45 years old, that Maria is 5 years old, and that her brother is 3 years old (being 2 years younger than she is), the mean is calculated using this equation:

First add up the prices of each of the cars:

Then divide that number by the total number of cars:

Answer: The average price of a car Olivia is considering is 

First, add the numbers in the set:

Then divide by the amount of numbers in the set:

Answer: The mean is .

To solve, simply add them all up and divide by their total.

Thus,

To solve for mean, you must add up all of the values in your set then divide that total by the number of values you have.  

The problem already gave us the total amount  which represents the total for the year.  

They ask for the monthly average which would mean you divide the total amount by the number of months which there are  months in a year.  

So the answer would be, 

 potatoes per month.

Since the mean is calculated by adding up all of your values together and dividing by the total number, it is affected by changes in values on the high or low end.  Since one of the values is increased, the numerator in your calculation would also increase.  But the total number of values did not so the denominator stays the same.  With only the numerator going up, the final value will also go up.

Find the mean of the following data set:

First, let's rearrange our numbers in increasing order:

Now, the mean can be found by dividing the sum of our numbers, by the total number of terms. In this case, we have 15 terms, we do the following:

So, our mean is 79.

If you add a value that is the same value as the mean, the mean will stay the same.  Your total value will proportionally increase by the average value which will be offset by increasing the denominator by . 

To find the average, you must add all of the grades together and divide by how many you have.  

Since you need to find a fifth grade to get a  average, your equation will be, 

.  

To work backwards to find , you must first multiple both sides by  resulting in,

 .  

Then you subtract all the other grades from your point total of  and you are left with .

In order for James to receive an 82% as his average or mean score for the seven tests, he would need to recieve a 94% on his last test.  

To calculate what the total amount of points needed, first find out how many points in total he would need to have this average.  

 represents how many points in total he would need to have the 82 average.

If you add up all of the grades he received on the six tests that he already took, he has accumulated a total of 480 points. The difference between the amount of points he needs, which is 574 and the amount of points he needs is calculated as follows:

He would need to get a 94 on his last test in order to get an 82% average or mean for his 7 test grades.