Răspuns :
6+7+8+9=30
30.................... 100%
6...................... x %
____________________
x=6x100/30
x=20%
30.................... 100%
6...................... x %
____________________
x=6x100/30
x=20%
probabilitatea=nr cazurilor favorabile/nr cazurilor posibile
p=6/30=1/5 =0,2%
p=6/30=1/5 =0,2%