[tex]\displaystyle\bf\\Numarul~total~de~elevi~este:\\1+6+7+14+23+29+30=\\=(1+29)+(6+14)+(7+23)+30=\\=30+20+30+30=\boxed{\bf110}\\\\p=\frac{Nr.~de~cazuri~favorabile}{Nr.~total~de~cazuri}=\frac{30}{110}=\boxed{\bf\frac{3}{11}}=0,\!(27)=\boxed{\bf27,\!(27)\%}[/tex]