Chernoff Bound independent X1,X2,...,XnE {0,1} X=∑X,EX]=u i=1 0<6≤1: Px之+<ae(-"肾) r≤1-洲<即(-) t≥2eu: Pr[X≥t≤2-tX = X n i=1 Xi E[X] = µ independent X1, X2,...,Xn 2 {0, 1} Chernoff Bound Pr[X (1 + )µ] < exp ✓ µ2 3 ◆ Pr[X (1 )µ] < exp ✓ µ2 2 ◆ Pr[X t] 2t 0 < 1 : t 2eµ :