On the average one person dies out of every 10 accidents find the probability that at least 4 will be safe out of 5 accidents.

Probability of dying = 110probability of safe = 1-110=910Now out of 5 incidence we have to find the probability that least 4 are safe so required probability = 4 fafe 1 dies+5 safe=910×910×910×910×110+910×910×910×910×910=656110000×110+910=656110000

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