To find the mean (or average) of a data set, you add all of the numbers within the set, then divide by how many numbers are in the data set.  In other words,

We will first find the sum.

Now, we will determine how many numbers are in the data set. 

This is true, because the set contains 5 numbers.  

Now, we will substitute. 

Therefore, the mean of the data set is .

Find the mean of the following data set:

To find the median, we need to add up all our terms and divide by the number of terms. This is the same process used to find the average of a group of numbers

Because there are 7 terms in our series, we divide by 7

So, we can say our answer is 61

To find the mean of a data set, we add all of the numbers within the set, then we divide that by the number of numbers within the set.  In other words, we will use this formula:

So, using the data set

we will first find the sum of the numbers.  This means we will add the numbers.  So,

Now, we will find the number of numbers.  This just means that we will count and see how many numbers are in the set.  So, in the set

we can see there are 7 numbers.  So,

Now, we can substitute into the formula.  We get

Therefore, the mean is .

To solve, first add all the numbers in the set:

Then divide by the amount of numbers in the set:

Answer: The mean is .

What is the mean of the following data set?

First, find the sum of our terms:

Next, divide the sum by the total number of terms

So our answer is 1010

To find the mean of a data set, we will use the following formula:

So, given the data set

we will first find the sum.  To find the sum, we will add the numbers together.  So,

Now, we will find the number of numbers within the set.  To do this, we will simply count and see how many numbers are in the set. So,

Now, we will use this and substitute into the formula.  We get

Therefore, the mean of the data set is .

Since averages are outlier sensitive, they will go up when higher values are added or go down when lower numbers are added.  Since the new test grade is higher than the average, the average will increase. 

Find the mean of the following data set:

To find the mean, we need to add up all our terms and divide by the number of terms.

We have eleven terms, so do the following:

Find the mean of the following data set:

Begin by finding the sum of our terms.

Next, because we have 11 terms, we need to divide the sum by 11

So our mean is 43

To find the mean of a data set, we will use the following formula:

So, given the data set

we can find the sum of the numbers in the set.  To find the sum, we will add all the numbers together.

Now, we will find the number of numbers within the set.  To do this, we will just count and see how many numbers are in the set.

Now, we can substitute what we know into the formula.  We get

Therefore, the mean of the data set is .