A workman operates 12 machines of the same type. The probability that one machine will require his
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A workman operates 12 machines of the same type. The probability that one machine will require his attention during a time interval of duration \(\tau\) is \(1 / 3\). What is the probability that:
(a) during time \(\tau 4\) machines will demand the attention of the workman;
(b) the number of such demands during time \(\tau\) will lie between 3 and 6 (including the boundaries)?
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