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maryd316
12.12.2019 •
Mathematics
Mrs. brown gives two tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. what
percent passed the second test given that they passed the first test?
a)
15%
b)
33%
67%
d)
75%
Solved
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Ответ:
C) 67%
Step-by-step explanation:
Conditional probability:
P(A given B) = P(A and B) / P(B)
P(passed 2nd given passed 1st) = P(passed 2nd and 1st) / P(passed 1st)
P(passed 2nd given passed 1st) = 0.30 / 0.45
P(passed 2nd given passed 1st) = 0.67
Ответ: