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In statistics, sigma is a measure of the standard error of a variable. That is a measure of the spread of the variable around its mean value.
Many variables are distributed approximately according to the Gaussian (Normal) distribution. Even when they are not, the means of repeated samples are (Central Limit Theorem). For the Gaussian distribution, 95% of the observations lie within 1.96*sigma from the mean. This is sometimes rounded to two sigma. While for an exact Gaussian distribution 2 sigma would imply 95.45%, for approximate Gaussian, it is still "around" 95%.
Thus, for example, average IQ (whatever it measures, which certainly is not intelligence!) is 100 and sigma = 15. So 95% of the population will have IQs between 100-2*sigma and 100+2*sigma, which is 70 and 130.
By the way, if you think my comment about what IQs measure is sour grapes, I assure you that is nowhere near the truth!
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What is one minus two plus three minus four plus five?
3.
What number comes next 1 5 3 7 5 9?
7 (Seven) is the next number in your sequence ! Plus four minus two plus four minus two plus four minus two and so on and so on !
Do two plus signs make a minus?
In addition and subtraction, if the plus sign is larger than the minus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sign, the answer will be a minus. For example: -10 minus + 20 = -10 In multiplication, if you have 2 plus signs, the answer will be a plus sign. If you have 2 minus signs, the answer will be a plus sign then, too. But if you have a plus and a minus sign, then the answer will be a minus. For example: +5 x + 2 = +10 -5 x - 2 = +10 -5 x +2 = -10
What is a plus and a plus if a plus and a minus is a minus?
A plus + a plus is a plus.
Why -2 times minus 2 equals plus 4?
When two numbers have the same sign, whether plus or minus, their product is positive. When two numbers have opposite signs, their product is negative.
What area within one standard deviation between and mu and minus and sigma and and mu plus and sigma?
The answer will depend on the distribution of the variable.
What is minus two plus minus six?
-8
What is one minus two plus three minus four plus five?
3.
What is Plus and minus are two?
If something plus and minus something else make two then the initial value must be 2.
What is two minus one minus one plus one minus one plus three minus two plus six?
9A:2 - 1 - 1 + 1 - 1 + 3 - 2 + 6 = 7The answer is seven.
What is the answer to three minus three times six plus two?
Three minus three times six plus two is equal to -13.
Does plus minus mean plus?
Same mathematical signs equal plus Different mathematical signs equal minus Plus Plus = Plus (+)(+) = + Minus Minus = Plus (-)(-) = + Plus Minus = Minus (+)(-) = - Minus Plus = Minus (-)(+) = - So the direct answer to your question would be: plus minus equals minus
What is two minus zero minus zero plus zero?
It Equals 2
What are the two signs of angle?
Plus and minus.
What number comes next 1 5 3 7 5 9?
7 (Seven) is the next number in your sequence ! Plus four minus two plus four minus two plus four minus two and so on and so on !
What five eights plus two thirds minus one fourth?
Five eights plus two thirds minus one fourth is equal to 1.04
What is nine tenths plus two fifths minus one fourth?
Nine tenths plus two fifths minus one fourth is equal to 1.05
