ISEE Middle Level Math : How to find mean

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

Example Question #111 : Mean

Find the mean of the following numbers:

Possible Answers:

Correct answer:

Explanation:

When we find them mean, we are finding the average of the number set.

The first step is to find the sum of all the numbers by adding them.

This gives us 280.

Then we divide this by the total amount of numbers in the number set, which is 8.

So

 .

Example Question #112 : Mean

Find the mean of the following number set:

Possible Answers:

Correct answer:

Explanation:

To find the mean, we are finding the average of the number set.

So we first add all of the numbers, which gives us 42.

Then we divide 42 by the amount of numbers in the number set which is 7, so 

.

Example Question #113 : Mean

Find the mean of the following number set:

Possible Answers:

Correct answer:

Explanation:

When we find the mean, we are finding the average of the number set, so we add all the numbers together which gives us 245.

Because there are 7 numbers we divide 245 by 7 and are left with the mean, 35.

Example Question #22 : Data Analysis And Probability

Find the mean in this set of numbers:

5570, 4886, 5226, 4120, 6561, 4120, 6008

Possible Answers:

Correct answer:

Explanation:

First, add all the numbers in this set:

Then, divide that amount by the total number in the set:

 

Answer: The mean is 5213.

Example Question #364 : Data Analysis And Probability

Find the mean of the following data set:

Possible Answers:

Correct answer:

Explanation:

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 .

Example Question #111 : Mean

While shopping for a couch, Mila found four she really liked. Each cost , and . What is the average price of a couch Mila is considering?

Possible Answers:

Correct answer:

Explanation:

First, add all the prices:

Then, divide by 4 (the number of couches):

Answer: The average price of a couch Mila is considering is $612.

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