Question

Dau 30 puncte + coronita.

Answer 1

54.......?%
360.......100%
54*100=5400/360=15% din elevi au nota intre 7 si 7,99
15*720=10800/100=108 elevi cu nota intre 7 si 7,99
18..... ?%
360...100% 
18*100=1800/360=5%
Probabilitatea este 5/100, adica 1/20

Answer 2

360° .........................720 elevi
54° ...........................X elevi
X = (54·720)/360 = 54·2 = 108 elevi care au luat note intre 7,00 - 7,99
360° ................................. 720° elevi
18 ° .................................. Y  elevi
     Y = (18 · 720)/360 = 36 elevi cu nota 10

P(a) = nr cazuri favorabile/ nr cazuri posibile
P(a) = 36/720= 1/20