The first natural number is usually taken to be 1. The mean of one number is itself so the mean of the first natural number is 1.
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No, Negative Nine or -9 is not a natural number since natural numbers mean only those numbers which start from 1 to infinity. No negative integers are included in this category of numerals.
List the integers that will divide into the number evenly with no remainder.
It means you are finding what number multiplied by itself will give you the number you are finding the square root of.
i means imaginary number or what you would find the square root of to make -1
it means the average. to find it, you add all the numbers you want to find the average of and divide it by the number you used. For instance, if you wanted to find the mode of 5,7,8,9,1 you would first add all the numbers which is 30. Then, because you are finding the average of 5 numbers, you would do 30/5 which is 6.