skboy1050
20.03.2020 •
Mathematics
The probability that a randomly selected elementary or secondary school teacher from a city is a female is , holds a second job is , and is a female and holds a second job is . Find the probability that an elementary or secondary school teacher selected at random from this city is a female or holds a second job.
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Ответ:
The probability that an elementary or secondary school teacher selected at random from this city is a female or holds a second job is 0.90.
Step-by-step explanation:
Denote the events as follows:
X = an elementary or secondary school teacher from a city is a female
Y = an elementary or secondary school teacher holds a second job
The information provided is:
P (X) = 0.66
P (Y) = 0.46
P (X ∩ Y) = 0.22
The addition rule of probability is:
Use this formula to compute the probability that an elementary or secondary school teacher selected at random from this city is a female or holds a second job as follows:
Thus, the probability that an elementary or secondary school teacher selected at random from this city is a female or holds a second job is 0.90.
Ответ: