Sending postal mail to mailbox damage has occurred, 15% have come to sample a random letter and 310 people at random people launch? 2 it appears that the 260 people received two letters in good condition, 40 people received 1 mail in original condition, is damaged, there are 10 1 and receive mail both two enactments that test the damaged mailbox. Binomial distribution 0.10 significance level?
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