The mean is 500. So, I am using Gaussian integral whose values are already calculated in table. $$F\left(\frac{2500-2500}{20}\right) - F\left(\frac{490 - 500}{20}\right)= 0 + 0,5 - F(0,5) = 0,5 - 0,1915 = 0,3175.$$. I think I may be wrong when regarding the first part of the equation. Should I add to the zero 0,5?
2026-03-26 03:01:26.1774494086
The probability that the amount of marbles (totally 2500) randomly tossed in five boxes will be no less than 490 in one specific box.
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