[Maths Class Notes] on Arithmetic Mean and Range Pdf for Exam

Arithmetic Mean in Statistics

Statistics is an extremely interesting and important subject. It involves the detailed study of data that is present in the form of numbers. Statistics help us in the analysis of a data set and drawing out conclusions from them. Statistics involves the calculation of various arithmetic quantities. The different quantities found to analyze data include geometric mean, arithmetic Mean, mode median, and a lot more. The arithmetic mean in statistics can be found for any given set of data irrespective of how vast the data set is. 

Arithmetic Mean calculator will help us to find the average of all the values of a data set and hence help us analyze the given data set. 

Define Arithmetic Mean

The arithmetic mean is a statistical value that is calculated by finding the sum of all the values of a dataset and then dividing the total sum by the number of individual entries in the data set. This is a traditional method to find the arithmetic mean and also called average.

Arithmetic Mean Calculator

Calculating arithmetic mean is not a difficult job and can be done easily. To calculate Arithmetic Mean, you need to implement this simple formula: 

You first need to sum up all the elements of the data set as represented above. X1, X2…Xn are the individual elements of a data set. All these elements are added and then their sum is divided by N, that is the number of terms. 

Define Geometric Mean 

Just like arithmetic mean, geometric mean is another statistical quantity. It is another type of average that signifies the central tendency by using the product of the values. It is a special type of average, set apart from Arithmetic Mean, and is found out for a set of finite values. Geometric mean, also like arithmetic Mean, helps in analyzing the given data set. 

Geometric Mean Calculator

To calculate the geometric mean, there’s a simple formula. You can use this formula to calculate it. 

Geometric mean equation

In the formula given above, X1, X2 ….. Xn are the individual entries of a given data set and to find the geometric mean the numbers are multiplied and then the product’s nth square root is found, where n is the number of entries. 

Define Arithmetic Progression 

An arithmetic progression is a special series of numbers where the difference between each preceding and succeeding number is constant. The difference between two consecutive terms is called the common difference. The only condition to satisfy in this case is that the difference between each consecutive term should always remain constant. So, to check whether a given series is an arithmetic progression, you need to pick a set of two consecutive terms from the series and find the difference between them, if this trend is followed uniformly throughout, then the series is an arithmetic progression.

Let us look at an example of an arithmetic progression to understand them in a better way.

Example:  2,4,6,8,10

The above-mentioned series is an arithmetic progression with a common difference of 2 since the difference between two consecutive terms is always 2.  Another condition which arithmetic progressions follow is 

B= A+C/2

Where a,b,c are three consecutive terms of a series. We can check for this condition in the example given above. 

2+6/2 = 4, here a, b and c are 2,4 and 6 respectively. 

Geometric Series Definition

Geometric series is a series of numbers where two consecutive numbers have a common ratio. That means, if you take any two consecutive terms of the series and then divide it, you’ll always get the same number. The same number which you’d get upon performing the division is called the “common ratio”. To check if 3 consecutive terms are in a geometric progression, then you can verify the following condition.

B²= ac 

Where a, b, and c are 3 consecutive terms of a series

If the condition mentioned above is satisfied, then the three given numbers are in a geometric progression. 

Let us analyze geometric progressions with an example.

Example: 2,4,8,16,32

In the above-mentioned example, the series is a generic example of a geometric progression. The common ratio of this geometric progression is 2. We could verify the b²=ac in this case. 

4²= 2×8

Here a,b,c are 2,4 and 8 respectively. Similarly, if we select any three random terms from the series, the relation would be followed. 

Problem: Find the Arithmetic Mean of the Following Numbers

56, 378, 44, 38

Solutions

Firstly, find the sum of the two numbers, 56, 378, 44,38. The sum, in this case, is 516 So, the Arithmetic Mean of the two numbers is 516÷4, that is 129.