• ### Statistics question involving standard deviation.?

Suppose men have an average weight of 190 with a standard deviation of 10 and have a normal distribution. What is the probability that 4 randomly chosen men will weight a total of more than 800?
Suppose men have an average weight of 190 with a standard deviation of 10 and have a normal distribution. What is the probability that 4 randomly chosen men will weight a total of more than 800?
2 answers · Mathematics · 2 weeks ago
• ### How do you define whether a structure is natural or artificial?

Are only manmade structures artificial? Are all structures not made by man natural? Is a bird's nest artificial? A beaver's dam? A steel mill? Would extraterrestrials say everything on earth is natural, since nothing here was made by them?
Are only manmade structures artificial? Are all structures not made by man natural? Is a bird's nest artificial? A beaver's dam? A steel mill? Would extraterrestrials say everything on earth is natural, since nothing here was made by them?
Biology · 2 weeks ago
• ### If you put a fish in a liquid water ocean on a planet with a surface gravity ten times earth's, would the fish have any weight?

A fish, or anything that floats, is weightless in the water, isn't it? Would it still be weightless in water if gravity were much stronger?
A fish, or anything that floats, is weightless in the water, isn't it? Would it still be weightless in water if gravity were much stronger?
4 answers · Physics · 2 weeks ago
• ### Counting cards in blackjack using a computer program.?

Why don't casino blackjack players use an app on their phone to keep track of the cards and tell them how much to bet and when to take a card? It would be much easier than counting cards in your head. It is not cheating, so it would be allowed.
Why don't casino blackjack players use an app on their phone to keep track of the cards and tell them how much to bet and when to take a card? It would be much easier than counting cards in your head. It is not cheating, so it would be allowed.
7 answers · Gambling · 2 weeks ago
• ### Division by zero in a real world problem?

When resistors are in parallel, the total resistance is given by 1/Rtotal = (1/R1) + (1/R2) If R1=0 how do you compute the total resistance? You will get 1/0 in the formula. I know the R total is 0 from physics, but how would you handle the mathematics?
When resistors are in parallel, the total resistance is given by 1/Rtotal = (1/R1) + (1/R2) If R1=0 how do you compute the total resistance? You will get 1/0 in the formula. I know the R total is 0 from physics, but how would you handle the mathematics?
9 answers · Mathematics · 2 weeks ago
• ### Is there a name for a hypothetical property that surpasses consciousness?

There is an emergent property of complex systems, like a brain or maybe a computer, called consciousness. If a system is far more complex than a human brain, perhaps a completely new property emerges. Something even more amazing than consciousness. Is there a name for this new property? Has anyone written on this topic? Is there a book or website or... show more
There is an emergent property of complex systems, like a brain or maybe a computer, called consciousness. If a system is far more complex than a human brain, perhaps a completely new property emerges. Something even more amazing than consciousness. Is there a name for this new property? Has anyone written on this topic? Is there a book or website or author that you recommended?
7 answers · Philosophy · 3 weeks ago
• ### Is there anything on earth that is unique?

I don't mean a person or snowflake. There are many of them. Is there anything that is one-of-a-kind unique in a category all its own?
I don't mean a person or snowflake. There are many of them. Is there anything that is one-of-a-kind unique in a category all its own?
15 answers · Philosophy · 3 weeks ago
• ### Why are so many people against cloning humans? What do they think is dangerous or wrong about cloning?

8 answers · Anthropology · 4 weeks ago
• ### Is it better to drive safely or obey the law?

When you must make a choice, is it better to drive your car safely and get a ticket or follow all traffic rules and risk having an accident?
When you must make a choice, is it better to drive your car safely and get a ticket or follow all traffic rules and risk having an accident?
7 answers · Safety · 4 weeks ago
• ### Why don't people pray for God to change the past?

God is not restricted by space or time. He can do anything. So why don't people ask him to stop a tragic event that happened in the past?
God is not restricted by space or time. He can do anything. So why don't people ask him to stop a tragic event that happened in the past?
10 answers · Religion & Spirituality · 1 month ago
• ### What number less than one million has the most factors? (Total factors, not just prime factors.)?

I know the formula for number of factors is the product of one more than the exponent of each prime factor. But without checking every number, how do you find this? Do you use Lagrange Multipliers? Diophantine techniques? Trail and error?
I know the formula for number of factors is the product of one more than the exponent of each prime factor. But without checking every number, how do you find this? Do you use Lagrange Multipliers? Diophantine techniques? Trail and error?
1 answer · Mathematics · 1 month ago
• ### What is the lowest animal on the ladder of evolution that is conscious?

Obviously, a one celled ameoba is not conscious. But a dog and monkey are conscious. What is the most primitive conscious animal? How did consciousness first evolve from organisms that were not conscious?
Obviously, a one celled ameoba is not conscious. But a dog and monkey are conscious. What is the most primitive conscious animal? How did consciousness first evolve from organisms that were not conscious?
6 answers · Biology · 1 month ago
• ### Where were you and what were you doing for an infinite amount of time before you were born?

Did God keep us all in a state of nothingness before we became conscious and alive? He doesn't put us into nothingness when life is over so why does he before life? Or were we in Heaven before life? Why don't I remember it?
Did God keep us all in a state of nothingness before we became conscious and alive? He doesn't put us into nothingness when life is over so why does he before life? Or were we in Heaven before life? Why don't I remember it?
13 answers · Religion & Spirituality · 2 months ago
• ### How could God have existed for an infinite amount of time in the past when time itself began at the Big Bang 14 billion years ago?

21 answers · Religion & Spirituality · 2 months ago
• ### What happens to a person if eternity is over before they die? According to Relativity, an infinite amount of time passes for the outside?

universe while only a few hours pass relative to a person falling into a black hole. If an astronaut someday falls into a black hole, all eternity will have passed in Heaven before he crosses the event horizon and dies. (This time dilation effect has been proven with atomic clocks.) So what do Christians believe will happen to the unlucky astronaut... show more
universe while only a few hours pass relative to a person falling into a black hole. If an astronaut someday falls into a black hole, all eternity will have passed in Heaven before he crosses the event horizon and dies. (This time dilation effect has been proven with atomic clocks.) So what do Christians believe will happen to the unlucky astronaut when he dies?
3 answers · Religion & Spirituality · 2 months ago
• ### Can the solution to any differential equation always be expressed as an infinite series (a Taylor series expansion) ?

1 answer · Mathematics · 2 months ago
• ### Why is the night sky dark?

Light from stars diminishes with the square of the distance. The number of stars increases with the square of the distance from earth (on average, on the large scale). The distance factors cancel out, so the whole night sky should be as bright as a star. Why is it dark?
Light from stars diminishes with the square of the distance. The number of stars increases with the square of the distance from earth (on average, on the large scale). The distance factors cancel out, so the whole night sky should be as bright as a star. Why is it dark?
10 answers · Astronomy & Space · 2 months ago
• ### Is sqrt(9) = 3 only or is -3 also correct? I was told that the sqrt symbol always means positive root only?

A ball is thrown up. At what time is it 45 meters below its maximum height? T = sqrt(2d/g) g = 10 m/s^2 T = sqrt(2*45/10) = sqrt(9) = 3 sec. But -3 sec is correct also. It is 45 below its max on its way up and on its way down. So why should we ignore the negative square root?
A ball is thrown up. At what time is it 45 meters below its maximum height? T = sqrt(2d/g) g = 10 m/s^2 T = sqrt(2*45/10) = sqrt(9) = 3 sec. But -3 sec is correct also. It is 45 below its max on its way up and on its way down. So why should we ignore the negative square root?
6 answers · Mathematics · 2 months ago
• ### Why does God exist, rather than absolutely nothing at all?

I am asking this to people who believe in God.
I am asking this to people who believe in God.
10 answers · Religion & Spirituality · 2 months ago
• ### How would you describe colors to a blind person who never saw anything? Could he picture in his mind what blue or red looks like?

6 answers · Optical · 2 months ago