An irrational number is a number that cannot be expressed as a fraction p/q for any integers p and q. Irrational numbers have decimal expansions that neither terminate nor become periodic. Every transcendental number is irrational.
Eric A. Hanushek -- It is no secret that some school districts spend their money better than others. One can easily find groups of districts with the same student demographics and with the same expenditure levels producing very different levels of student achievement. Put another way, some (many?) districts are spending more than they need to spend, based on what other districts show is possible.