Empirical probability?
During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person.
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The probability is 13/20 which is equal to 0.65 . Hence the telemarketer had 3 answering machines it seems some of them(or all of them) try to answer,but this can be ignored because in above statistic we are not counting the number of persons whom telephone to telemarketer.
13/20 = 0.65
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