Sergey,

You are right, I think I've errored in the the error value of the calculation. I'm going to have to dig out some old stuff so that I can correct the error.

>>Sergey,
>>
>>Yes they do, that's why the final result is controlled by the least accurate value involved in the calculation.
>
>David,
>
>That's not what I was refering to. Are you sure that imlicit error in the result of following calculation is 0.00005 not bigger?
>
>3.1000 ± 0.00005 * 2.5567 ± 0.00005 is 7.9258 ± 0.00005
>
>P.S. I maybe mistaken but I'm to leazy to go and read books on the subject. :-)