31 = 1 + 2 + 3 + 4 + 21
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19
2 + 37 + 41 + 47 + 53 = 180
There are no 5 odd numbers that when added together make 30.Two odd numbers added together make an even numberAn odd number plus and even number makes an odd number.From the five odd numbers:Take two of them and add them together getting an even number and four odd numbersAdd another of the odd numbers to this even number and you will have three odd numbersAdd two of these together and you will have one even and one odd number.Finally add these odd and even numbers together and the result will be an odd numberBut 30 is an even number, so cannot be the sum of five (or any odd number of) odd numbers.
No two whole numbers satisfy these parameters. However, -11.787088*6.787088=-80 (within 10-5) and -11.787088+6.787088=-5
The mean number of a number set is the same as the average number of a number set. It is the number that results from adding all of the numbers in a set together and then dividing by the amount of numbers you added together. For example, in the set 1, 2, 3, 4, 5, you add the five numbers together and get 15. There are five numbers in the set, so when you divide 15 by 5, you get 3. This is the mean number.