mean ≤ 5; 2+5+2x+74 ≤ 5= 14+2x4≤5= 14 + 2x ≤ 5 x 414 + 2x ≤ 20 ; 2x ≤ 20 - 142x ≤ 20 - 142x ≤ 6x ≤ 62x ≤ 3