On average, every one out of 10 telephones is found busy. Six telephone numbers are selected at random. Find the probability that four of them will be busy.
Question
Solution 1
To find the probability that four out of six telephone numbers will be busy, we can use the concept of binomial probability.
The probability of a telephone being busy is 1 out of 10, or 1/10. Therefore, the probability of a telephone not being busy is 9 out of 10, or 9/10.
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