Apportionment among school districts of school fund income. 13-13-1. The commissioner of school and public lands, after any adjustments that have been made pursuant to § 5-10-18.3, shall apportion the school funds as follows: the follows:the: (1) The commissioner shall ascertain from the division of education the total number of resident pupils students in average daily membership membership, as defined in § 13-13-1.1 13-13-8 1.1, in each school district and the total number of pupils students in average daily membership in all school districts, and on that basis of the school population, the the; and (2) The commissioner shall apportion to each school district, pro rata, such share, as its population of resident pupils students in average daily membership in the school district bears to the total number of pupils students in average daily membership in all school districts. The funds to be apportioned include funds derived from the lease of school lands, the lease of public lands not apportioned to any educational, penal, or charitable institution, the interest, dividends, and other income on invested funds derived from the sale of school lands and public lands not apportioned to any such institution, institution of these institutions, and the interest, dividends, and other income on invested funds derived from the five percent paid by the United States on the sale of public lands within the state. state, and the distribution amount from the unclaimed property trust fund, pursuant to § 43-41B-24.5. 22