Well, darling, 23 is a Prime number, so the only numbers that divide evenly into it are 1 and 23. That's it, no other numbers are getting a piece of this prime number action. So, if you're looking for divisors of 23, those are the only two lucky winners.
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69 = 3 * 23
The numbers '1' and '23' evenly divide both 23 and 46.
23
You divide by the number of numbers - if you want the mean of three numbers you divide by 3, if you want the mean of a hundred numbers you divide by 100.
Mean is a fancy word for "Average". To calculate an average of a set of numbers you must add together the set of numbers and divide by the amount of numbers in the set. Let's solve your problem.4, 12, 23, 11, 5. Remember the first step is to add all the numbers together.4 + 12 + 23 + 11 + 5 = 55.Now we need to do step two - which is to divide by the amount of numbers in the set. In this case we added together 5 numbers.55/5 = 11.So the Average of {4,12,23,11,5} = 11.