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Why two tail of normal distribution do not touch the horizontal axis?
The domain of the Normal distribution is the whole of the real line. As a result the horizontal axis is asymptotic to the Normal distribution curve. The curve gets closer and closer to the axis but never, ever reaches it.
Is the range in distribution ever smaller than standard deviation in a distribution?
No.
Can the margin of safety ever be negative?
yes it can be negative.
Will the children and adults with autism ever be normal?
It depends what you mean by "normal". If by normal you are asking if autistic people will ever become neurotypical - no, that's like asking if black people can ever become white. Who wants to be normal anyway?
Can the mean ever be negative?
Yes, if you are averaging numbers that include negative numbers.
Will time travel into the past ever be possible?
This is not likely to happen - although there is currently lots of theoretical research on the topic.
Will conner ever ask you out?
Negative, ghostrider.
Can a square root ever be negative?
Yes.
Can any of the measures of dispersion ever be negative?
no
What is a negative multiplied by a negative?
negative*negative=positive negative/positive=negative negative\negative=positve negative-positive=change the sign to a plus and then change the number after the sign and get your answer negative +positive=which ever numbr is bigger minus positive+positive=positive
Can standard deviation and variance be negative?
No. Neither the standard deviation nor the variance can ever be negative.
Is the word ever a preposition?
No, "ever" is not a preposition. It is an adverb used for emphasis in questions or negative statements.
