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augestfaith
29.11.2019 •
Mathematics
In a city school, 70% of students have blue eyes, 45% have dark hair, and 30% have blue eyes and dark hair. what is the probability (rounded to the nearest whole percent) that a randomly selected student will have dark hair, given that the student has blue eyes?
hint:
p(a|b)=p(a∩b) / p(b)
46%
43%
21%
67%
Solved
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Ответ:
The correct answer option is 43%.
Step-by-step explanation:
We are given that 70% of students have blue eyes, 45% have dark hair, and 30% have blue eyes and dark hair.
We are to find the probability of a student getting selected will have dark hair with blue eyes.
P(D|B) = P(D∩B) / P(B)
Substituting the given values in it to get:
P(D|B) = 0.3 / 0.7 = 0.428
Rounding it to the nearest whole percent we get:
0.428 × 100 = 42.8% ≈ 43%
Ответ:
WX=ZY would prove that the quadrilateral WXYZ is a parallelogram
Step-by-step explanation: