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Strictly speaking, it is not, but the range -3 to +3 accounts for 99.73% of the total probability.

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Q: Why is a z-score range -3 to plus 3?
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Related questions

Another name for a standardized value of an observation in a normal distribution?

zscore


Is y equals x squared -4x plus 3 a domain or range?

Y = x squared -4x plus 3 is an equation of a function. It is neither called a domain nor a range.


Range of the function m equals 0.5n plus 3?

If the domain is the real numbers then so is the range.


What is the range of the equation y equals -x - 3 plus 10?

If the domain is the set of real numbers, so is the range.


What is the domain and range of 2x plus 3 divided by 5?

(2x+3) / 5 Domain = All Real Numbers Range = All Real Numbers


How can you calculate error using the plus or minus symbol ie. 1.5655 plus or minus 3?

1.5655 is your starting value, you need to both subtract and add 3 to that value to determine your range. 1.5655-3= -1.4345 1.5655+3= 4.5655 so your range is -1.4345 to 4.5655


How do you find range with percents?

you would divide by 2 then plus 3 times 4 and then you have you answer


What is the range of y equals -2x plus 3?

The Range is all the Real numbers you can think of. The Domain is also all Reals.


What is 6 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 p?

27x3+6=87.


What is 3 plus 3 plus 3 plus 3 plus 3 plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3plus 3?

3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 54.


What is 3 plus 3 plus 3 3 plus 3 plus 3?

3 plus 3 plus 3 is 9. 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 18.


What does plus plus -3 percent at 180 psi mean?

+/- 3% of 180 psi is the range allowed from 180 psi. To calculate 3%, multiply 180 * .03, then add or subtract to/from 180: 180 * .03 = 5.4 (round off to 5) the range is from 175 psi minimum to 185 psi maximum