The probability that exactly three of them work full time is 0.25.
It should be noted that from the information, we want to find P(X = 3).
This will be illustrated as:.
12C3(1 - 22%)^9(0.22)³
= 220(0.78)^9(0.22)³
= 0.250
Therefore, the probability that exactly three of them work full time is 0.25.
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