Upon completion of the examination, the clerk shall forthwith attach to the petition his certificate, properly dated, showing the result of the examination. If from the examination, the clerk finds that the petition is signed by the requisite number of qualified electors, he shall certify that the petition is sufficient. If, from the examination, he finds that the petition is not signed by the requisite number of qualified electors, he shall certify to the number of qualified electors signing the petition and to the number of qualified electors required to make the petition sufficient.