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1 and 4?
I assume you mean "squared" numbers?2² - 1² = 4 - 1 = 3
Standard deviation is equal to the square root of the variance. To arrive at this work out the mean, then subtract the mean and square the result of each number. Then work out the mean of those squared differences and take the square root of that.
subtract any number form nine and then with that answer and the number you subtracted 9 with, those added, make the sum of nine
36 is the only perfect square amongst those listed.
1 and 4?
It is: 16-4 = 12
25 (52) - 9 (32) = 16.
I assume you mean "squared" numbers?2² - 1² = 4 - 1 = 3
Standard deviation is equal to the square root of the variance. To arrive at this work out the mean, then subtract the mean and square the result of each number. Then work out the mean of those squared differences and take the square root of that.
subtract any number form nine and then with that answer and the number you subtracted 9 with, those added, make the sum of nine
36 is the only perfect square amongst those listed.
If you mean the square root is 20, the answer is 400. If you mean the square root of 20, the answer is about 4.47.
You do by subtracting one from the previous number and adding 10 to the top number of the digits you are regrouping. Subtract those two digits and you should get your answer.
Natural numbers are those numbers used for counting. The square root of 14 is the irrational number 3.74165... . Therefore, the square root of 14 is not a natural number.
They are called Non-square numbers.
The number is 81.