how to correct wikipedia edit error?

I was trying to study probability density function by reading:

http://en.wikipedia.org/wiki/Probability_density_function

after reading:

"...(2 hour−1)×(1 nanosecond) = 6×10−13...."

(the "10−13" above was written as 10 to the power of -13 and the "hour−1" was written as hour to the power of -1 so to mean "per hour", but this post doesn't seem to allow me to copy and post that here like it should be )

and spending some time confused trying to understand where on earth does the "6" and the "-13" come from, I have concluded that this is almost certainly an error and that should have been:

"...(2 hour−1)×(1 nanosecond) = 2×10−9...."

Can I have confirmation that I am right about that?

But, what I really want to know is, how do I contact wikipedia to make them correct such an error?
-I wouldn't like other readers to be confused by such error like I was as this is frustrating.

Originally posted by humy
But, what I really want to know is, how do I contact wikipedia to make them correct such an error?

Originally posted by humy
"...(2 hour−1)×(1 nanosecond) = 2×10−9...." .

You can freely edit Wikipedia. If your edit is wrong then someone is likely to revert the change. However, if you frequently make incorrect edits it is likely your editing privileges will be revoked (Wikipedia has revoked these privileges for many high schools, for instance).

Originally posted by twhitehead
I am not sure where the 6 came from, but:
5+ 0.01 hours corresponds to 2% (which is 0.02)
therefore:
5+ 10e-9 hrs corresponds to 2 * 10e-13

5+ 0.01 hours corresponds to 2% (which is 0.02)

therefore:
5+ 10e-9 hrs corresponds to 2 * 10e-13

Actually, I think you are correct and it should be e-9.

Originally posted by twhitehead
Actually, I think you are correct and it should be e-9.

Originally posted by KazetNagorra
You can freely edit Wikipedia. If your edit is wrong then someone is likely to revert the change. However, if you frequently make incorrect edits it is likely your editing privileges will be revoked (Wikipedia has revoked these privileges for many high schools, for instance).

Originally posted by twhitehead
It is Wikipedia. You do not contact them. You make sure you are correct, then you look up near the top of the page for 'edit' and you make the correction yourself.

On an unrelated maths problem (although still to do with probability ) :

Is there a way of simplifying the RHS expression in the equation:

y = ( x ^ n ) * ( ( 1 – x ) ^ ( e – n ) )

?

( don't know if this has any relevance but, for the application I have in mind, both n and e are natural numbers while x is a continuous random variable in the [0, 1] interval and y is necessarily always a positive real number and, perhaps slightly confusingly, represents a probability density of other possible probabilities! )

I am trying to make it a bit easier for myself to finds its integral.

Originally posted by humy
I have just realized I have made an error! In my calculations, I simply completely forgot to take into account that there are 3600 seconds in an hour!

Originally posted by humy
Don't worry; I will always check and double check.

I just spotted an edit error on that link!
it says:

"...Instead we might ask: What is the probability that the bacterium dies between 5 hours and 5.01 hours? Let's say the answer is "2%". Next: What is the probability that the bacterium lives between 5 hours and 5.001 hours? The answer is probably around 0.2%, since this is 1/10th of the previous interval. The probability that the bacterium lives between 5 hours and 5.0001 hours is about 0.02%, and so on...."

The two times it says "lives" above should be "dies" to correspond to the first time it said "dies". This is one of the corrections I will be making.

I have now carefully edited all the changes in:

http://en.wikipedia.org/wiki/Probability_density_function

All the changes I made are in the "Example" section only.
Does everyone approve?
The main change there I made is replace where it previously said:

"Instead we might ask: What is the probability that the bacterium dies between 5 hours and 5.01 hours? Let's say the answer is "2%". Next: What is the probability that the bacterium lives between 5 hours and 5.001 hours? The answer is probably around 0.2%, since this is 1/10th of the previous interval. The probability that the bacterium lives between 5 hours and 5.0001 hours is about 0.02%, and so on.

Therefore, in response to the question "What is the probability that the bacterium lives 5 hours?", a literally correct but unhelpful answer is "0", but a better answer is (2 hour−1) dt. This is the probability that the bacterium dies within a small (infinitesimal) window of time around 5 hours, where dt is the duration of this window. For example, the probability that it lives longer than 5 hours, but shorter than (5 hours + 1 nanosecond), is (2 hour−1)×(1 nanosecond) = 6×10−13.
The quantity 2 hour−1 is called the probability density for the bacterium to live 5 hours. ..."

with:

"..Instead we might ask: What is the probability that the bacterium dies between 5 hours and 5.01 hours? Let's say the answer is "2%". Next: What is the probability that the bacterium dies between 5 hours and 5.001 hours? The answer is probably around 0.2%, since this is 1/10th of the previous interval. The probability that the bacterium dies between 5 hours and 5.0001 hours is about 0.02%, and so on.

Because, for example, a probability of 2% is the same as a probability of 0.02, and because, for example, the interval of time between 5 hours and 5.01 hours is 0.01 hours (i.e. 1% of an hour), the probability that the bacterium dies between, for example, 5 hours and 5.01 hours being 2% can be said to have what it called a probability density of 2 per hour because (0.02 probability)/(0.01 hours) is 2 per hour. The probability density at 5 hours can be written as (2 hour−1) dt where the quantity 2 hour−1 is the probability density for the bacterium to live 5 hours and where dt is the duration of an arbitrarily very small window of time around 5 hours.

Therefore, in response to the question "What is the probability that the bacterium lives 5 hours?", a literally correct but unhelpful answer is "0", but a better answer can be written as (2 hour−1) dt. This is the probability that the bacterium dies within a small (infinitesimal) window of time around 5 hours, where dt is the duration of this window. For example, the probability that it lives longer than 5 hours, but shorter than (5 hours + 1 nanosecond), is (2 hour−1)×(1 nanosecond) which, because there are 3600 seconds in an hour and there are a billion nanosecond in a second, is (2 hour−1)×(1 nanosecond) = 2 × 10−9 / 3600 ≃ 5.556×10−13...."

Originally posted by twhitehead
It is Wikipedia. You do not contact them. You make sure you are correct, then you look up near the top of the page for 'edit' and you make the correction yourself.