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Răspuns :

a) 7+3+2+1=13 elevi (avand in vedere ca in paranteza este ≥)
    Daca iti cerea strict mai mare decat 7 aveam: 3+2+1=6 elevi

b) [tex]M= \frac{4*3+5*3+6*5+7*7+8*3+9*2+10}{3+3+5+7+3+2+1} [/tex]
     [tex]M= \frac{12+15+30+49+24+18+10}{24} [/tex]
     [tex]M= \frac{158}{24}=6,58 [/tex]