So, this is called what is called a long term statistics, in a long term I can, see earlier given H s given T p I find out what is the chance of this exceeding something, but here I am going long term. I am trying to find out what is the in 30 years chances of percentage of time H s may occur, you get my point now, this is just to give you a brief idea, this is how the oceanographers go.
See let me give you an example, we are designing a ship to go from here to, let us say Singapore, so it goes to a certain sea and let us say I have data for that particular sea. Now, I find out that in that sea chances of H s occurring 8 meter and more is only 2 percent, 6 meter to 8 meter is may be 20 percent, 4 to this is so many percent; now, for each one I will find out see for 8 meter is certain percentage, 6 to 8 is certain percent, now for each one I find out what is my response say roll if this, if 8 meter