# Basic Arithmetic : Mean

## Example Questions

### Example Question #21 : Basic Statistics

Find the mean for the following set of numbers:

, and

Explanation:

The mean is the same as the average. To find the mean, use the following formula:

### Example Question #21 : Basic Statistics

Find the mean of the following set of numbers:

Explanation:

Find the mean of the following set of numbers:

Finding the mean of a number set is essentially finding the average.

Begin by summing the numbers, then divide by the total number of terms.

Now, since there are 12 terms in the series, divide by 12

So our mean is 104.5

### Example Question #21 : Basic Statistics

Find the mean of the following data set:

Explanation:

Find the mean of the following data set:

Whenever we are working with a data set, it can be helpful to put the terms in order:

Now that our terms are in order, we can do all sorts of things with them.

In this case, we need to find the mean. This is essentially the same as the average.

Begin by finding the sum of our terms.

Now, because we have ten terms, we need to divide by 10

### Example Question #21 : Basic Statistics

Sally's algebra grade depends on three unit tests and a final exam. The grade for the final exam is weighted to equal the grade of two unit tests. What is the minimum grade that Sally must get on her final exam in order to have a class average of  or above for the course, if her unit test scores are , , and

Explanation:

The course grade average is calculated by using Sally's three test scores and final exam. student must score at least an average of ; therefore we can write the following:

Given that the average is calculated using three test scores and a final weighted as two regular tests, we can write the following equation.

Let's use these equations to construct an inequality where we will substitute in our known values and let a variable, , equal the final score needed to earn an a  or above.

Sally needs to at least score a  on the final to score  or above.

### Example Question #21 : Basic Statistics

In her last  basketball games, Jo scored  points,  points,  points,  points, and  points. How many points per game does she score on average?