Yes. For example, the mean of: 10,20,20,20,20,30 is (10+20+20+20+20+30)/6
That's 6. You count all the numbers but the last "0", as you don't need to have that to give the same result. 87.558 is the same as 87.5580
No, the geometric mean is not the same as the mean of two numbers.
All sets of 3 consecutive numbers will have the same mean and median
The product of numbers is the same as the multiplication of numbers
They are representations of numbers which need not be whole numbers.
That's 6. You count all the numbers but the last "0", as you don't need to have that to give the same result. 87.558 is the same as 87.5580
No, the geometric mean is not the same as the mean of two numbers.
List the numbers from least to greatest. Count in from both ends the same times and you will note there is no middle number, but 2 middle numbers. Take the average of the 2 middle numbers and that is the mean of the set.
You don't "count with fractions". Counting is done with natural numbers.
I am not entirely sure what you mean, but if you need to add, subtract, or compare two fractions, they need to have the same denominator.
No, there are infinitely many of them. However, there are "only" Aleph-null, or countably infinite numbers as compared with a higher infinity - the continuum - for the count of irrational numbers in the same interval.
All sets of 3 consecutive numbers will have the same mean and median
The mean is generally the same as the average. (there are the geometric and harmonic means, but they need not concern most people here). The mean of 3 numbers, each of which is 21, is also 21.
The product of numbers is the same as the multiplication of numbers
They are representations of numbers which need not be whole numbers.
The mean, with negative numbers, is calculated in the same way as with positive numbers. You add the numbers together (taking account of their signs) and divide by the count of numbers.Thus, the mean of 1, -2 and 4 is (1 - 2 + 4)/3 = 3/3 = 1.
There are no whole numbers that are not also counting numbers. Both terms mean the same subset of numbers: positive integers greater than zero. Some people consider zero to be a whole number but not a counting number, because you can't "count" zero.