That has a lot of applications, related to finding a general tendency, calculating or estimating the mathematical expectation (important for investments), etc.
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The mean value is the average of a group of numbers. All of the numbers in the group are first added all together. The sum of the number is then divided by however many numbers were in the group. The number that is arrived at is the mean value. The use of mean values is widely used in compiling statistical information.
It means the numbers you use when you count things. They are the positive integers, beginning with ' 1 ', and finding each number on the list by adding 1 to the previous number.
By finding the difference of them
In finding the LCM or HCF of two or more numbers
If there is an element of the domain that is mapped on to 0 then yes, else no.