Răspuns:
a) 9
b)25
c)6,56
Explicație pas cu pas:
a) 1+2+6 = 9 elevi ;
b) nr elevilor = 1+2+6+3+5+4+2+2 = 25 ;
nr elevilor care au obtinut nota peste 6 = 5+4+2+2 = 13 ; regula de trei simpla
25 elevi ____100%
13 elevi______n% ; n = 13x100/25 = 52% ;
media clasei = (1x3+2x4+6x5+3x6+5x7+4x8+2x9+2x10)/25 =
(3+8+30+18+35+32+18+20)/25 = 164/25 = 6,56
/ - supra
x - inmultire
