California Code, Education Code - EDC § 46303

(a) If any computation of average daily attendance made under, or necessitated by, any provision of law, results in a fraction of less than one-half of a unit, the average daily attendance shall be taken as the next lowest whole number, except that if such computation results in an average daily attendance of less than one unit, the average daily attendance shall be deemed to be one unit;  but if the fraction is one-half or more of a unit, the average daily attendance shall be taken as the next highest whole number.

(b) Whenever any reference is made to a specific whole number of units of average daily attendance said number shall include any fraction above said number which is less than one-half of a unit, and any fraction of one-half or more of a unit above the next lowest whole number.