ISEE Upper Level Math : How to find mean

Example Questions

Example Question #21 : How To Find Mean

Consider the data set

.

For what value of  does this set have a mean of ?

Explanation:

The mean of a nine-element data set is the sum of the data elements divided by ; therefore,

Example Question #21 : How To Find Mean

What is the mean of the following numbers?

Explanation:

The mean is equal to the sum of the values divided by the total number of values ().

Example Question #71 : Data Analysis And Probability

David's course score in a chemistry course is the mean of five tests. He has scored  and . What must he score on the fifth test to be assured of a course score of ?

Explanation:

Let  be the minimum fifth test score. Then the average of the scores is

.

, the minimum score David needs.

Example Question #77 : Data Analysis

What is the median of the following set?

Explanation:

The median is the middle number in a set when the numbers are ordered from smallest to largest. The first step is to rearrange the numbers from smallest to largest.

Given that there are 5 items in this set, the median will be the third number (which is the middle number. That number is 4, the correct answer.

Example Question #75 : Data Analysis

What is the mean of the set below?

Explanation:

The first step to finding the mean is to convert the set to integers.

This simplifies to:

The mean is determined by adding together the numbers in a set and then dividing by the total number of items in that set. This gives us:

Example Question #71 : Data Analysis And Probability

Find the mean of the following data set:

Explanation:

Find the mean of the following data set:

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

In this case, we have nine terms, so we will divide by nine.

Example Question #21 : How To Find Mean

Find the mean of the following data set:

Explanation:

Find the mean of the following data set:

Let's begin by rearranging our terms from least to greatest:

Next, we will sum up our terms and divide by the total number of terms. We have 11 terms, so our numerator will be 11.

Example Question #22 : How To Find Mean

Find the mean of the following data set:

Explanation:

Find the mean of the following data set:

For this question, the mean is essentially the same as the average.

Find the mean by adding up all our terms and dividing by the total number of terms.

In this case n=11 because we have 11 terms in our data set.

The sum can be found by adding our terms together.

So our mean is 59

Example Question #82 : Data Analysis And Probability

Find the mean of the following data set:

Explanation:

Find the mean of the following data set:

First, let's put our terms in ascending order.

Next, find the mean by adding up our terms and dividing by the total number of terms.

We have eleven terms, so our denominator will be eleven.

So our mean is 65

Example Question #22 : How To Find Mean

Use the following data set to answer the question:

Find the mean.

Explanation:

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

So, given the data set

we will calculate the sum.  To do that, we will add the numbers together.  So,

Now, we will calculate the following:

because if we count and see how many numbers are in the set, we get 10.

Knowing this, we can substitute into the formula.  We get