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Intermediate calculations are all of the calculations you make up until your final answer. So if one of the steps was 3/4 = .75 and then you had to multiply it by 17, you would leave it as .75 and multiply that by 17 giving you 12.75. If 12.75 was what you got for the very last step then you would round that to 13 as it would be the nearest whole number.
Fi = the forecast values of the parameter in question. Oi = the corresponding verifying value (observed or analysed) N = the number of verifying points (grid points or observations) in the verification area. RMSE is a measure of the average error, weighted according to the square of the error. It answers the question, what is the average magnitude of the forecast errors?, but does not indicate the direction of the errors.