# Calculate The Average Javascript

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Michael Zippo
04.11.2021

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*There are two ways to find the mean of a list of numbers in Python. You can divide the sum () by the length () of a list of numbers to find the mean . Or you can find the mean of a list using the Python function mean ().*

Finding the mean of a set of values ‚Äã‚Äãis a common Python task.

Announcement For example, you may have a list of product sales and want to know the average purchase price. Or, for a diversity report, you can calculate the average age of employees working for your organization.

## Python average

There are two methods to find the average of a list of numbers in Python:

- Calculate the sum of the list, then divide that number by the length of the list. The length of the list is the number of values ‚Äã‚Äãin the list. or ;
- Using the statistics. mean () method.

Although both methods return the average of a list of numbers, there are several factors to consider when choosing which one to use.

In this tutorial, we explain how to use the approaches mentioned above to find the mean of a list in Python. We’ll take a look at two examples to get you started.

## Python Average: Len () and Sum ()

The formula for averaging a list of values ‚Äã‚Äãis the sum of all the terms divided by the number of those terms . You can use the Python values ‚Äã‚Äãsum () and len () to calculate the average of numbers in a list.

The Python *len ()* method calculates and returns a number of numbers in a list. *len* is the abbreviation for length, which refers to the length or number of elements in a list.

The sum *()* in Python calculates the sum total of all values ‚Äã‚Äãof a list.

We can use these functions together to calculate the mean value from ’a list of values.

The basic formula to calculate an average in Python is:

This approach is common because you don’t need to import external values ‚Äã‚Äãto calculate an average.

### Sum () and len () function example

Let’s say we have a cafe and want to know the average price of all the orders placed to date. To calculate this number, we could use the sum () and len () methods we just saw:

We print the average value on the console:

In the first line of our code, we define a Python variable . This variable stores an order price list. Next, we calculate the average of these orders by dividing the ** sum ** of all the orders by the ** length ** of our list of orders.

At the end of our code, we print a message to the console telling us the average price of coffee orders.

We use the Python *round ()* method to round our average to two decimal places. The *str ()* method converts our average value to a string that we can print to the console.

We now know that the average price for a coffee order to date is $ 3.69.

## Python average: statistics. mean ()

The Python statistics library contains a function called *statistics. mean ()* which calculates the average value of a list of values. The term * mean * is used in mathematics to describe the mean of a list of values.

The syntax of the statistics. mean () method is:

statistics. mean (list_of_values)

The *media () * takes one parameter: the list of items you want to average.

Before using this method, you need to import the statistics module (*statistics*) into Python This is a built-in module that can be used to perform various calculations in Python.

This is an important difference between using the statistics. mean () and sum () and len () methods. sum () and len () can be used without importing a library. However, you must import statistics to use statistics. mean ().

If you don’t mind importing another library, this method works fine. Since you can calculate an average value without any libraries, you should consider rare to do so before using the statistics library.

We can import the statistics module using a Python import statement :

We can now access the *Mean ()* in the statistics library.

### statistic example. mean ()

We are now ready to start calculating averages using *Mean ()*.

Let’s take the example of the coffee orders we used above. Suppose we want to calculate the average price of coffee orders placed to date. We could use the following code to calculate the average price:

Let’s take a look at the output of our program:

Our program returns the same text and output as our first example.

### Calculate the average of a tuple

We can use *statistics. mean ()* to calculate the average value of a tuple, which is a sequence orderly and immutable elements. Here is an example of *statistics. mean ()* used to calculate the average price of a coffee order, with our information stored in a tuple:

Our code returns the same response as in the last example because we let’s work with the same numbers:

A tuple can be used in place of a list if you are working with values ‚Äã‚Äãthat should not change. So, since the prices of our coffee orders will not change after an order is processed, a tuple is appropriate.

### Average of negative values ‚Äã‚Äã

You can use *average ()* to calculate the average value of a set of negative numbers.

Suppose we have a list that stores the lowest daily temperatures recorded during a specific week in winter. We could use the following code to calculate the average of the lowest daily temperatures for that week:

Our code returns:

## Conclusion

< p> You can calculate the average of a list of values ‚Äã‚Äãusing the sum () and the len () or the statistics. mean () method. The statistics. mean () method must be imported into your program. You can use the sum () and len () methods without importing any external libraries into your code. Want to learn more about programming in Python ? Read our Python Learning Guide . This guide contains a list of the best learning resources you can use to improve your knowledge.

👻 *Read also: what is the best laptop for engineering students?*

We hope this article has helped you to resolve the problem. Apart from Calculate The Average Javascript, check other ast Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:

Olivia OConnell

Rome | 2023-03-22

Thanks for explaining! I was stuck with Calculate The Average Javascript for some hours, finally got it done 🤗. I am just not quite sure it is the best method

Manuel Zelotti

Rome | 2023-03-22

Maybe there are another answers? What Calculate The Average Javascript exactly means?. Will get back tomorrow with feedback

Boris OConnell

California | 2023-03-22

Thanks for explaining! I was stuck with Calculate The Average Javascript for some hours, finally got it done 🤗. Will use it in my bachelor thesis

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