Question

Media :4, 5, 6, 7, 8, 9, 10
nr elevi :1, 6, 7, 14, 23, 29, 30
Conform informatiilor din tabel, probabilitatea ca, alegand un elev din aceasta scoala, aceasta sa aiba media 10la limba engleza este egala

cu ... va rog ajutati ma

Answer 1

 

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