bac-s-maths 2023 Q4

bac-s-maths · France · bac-spe-maths__centres-etrangers_j2 1 marks Conditional Probability Bayes' Theorem with Production/Source Identification

Alice has two urns A and B each containing four indistinguishable balls. Urn A contains two green balls and two red balls. Urn B contains three green balls and one red ball. Alice randomly chooses an urn and then a ball from that urn. She obtains a green ball. The probability that she chose urn B is:
A. $\frac{3}{8}$
B. $\frac{1}{2}$
C. $\frac{3}{5}$
D. $\frac{5}{8}$

C. $\frac{3}{5}$

Alice has two urns A and B each containing four indistinguishable balls.\\
Urn A contains two green balls and two red balls.\\
Urn B contains three green balls and one red ball.\\
Alice randomly chooses an urn and then a ball from that urn. She obtains a green ball.\\
The probability that she chose urn B is:\\
A. $\frac{3}{8}$\\
B. $\frac{1}{2}$\\
C. $\frac{3}{5}$\\
D. $\frac{5}{8}$

Paper Questions

QExercise 2 QExercise 3 QExercise 4 Q1 Q2 Q3 Q4 Q5