Given that she is successful, the probability she studied for 4 hours is

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Solution

The correct option is B

Required probability = $\frac{0.7 \times 0.4}{0.7 \times 0.4 + 0.2 \times 0.6 + 0.8 \times 0.1}$

= $\frac{28}{48} = \frac{7}{12}$

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Given that she is successful, the probability she studied for 4 hours is

The correct option is B Required probability = 0.7×0.40.7×0.4+0.2×0.6+0.8×0.1 = 2848=712

The correct option is B

Required probability = $\frac{0.7 \times 0.4}{0.7 \times 0.4 + 0.2 \times 0.6 + 0.8 \times 0.1}$

= $\frac{28}{48} = \frac{7}{12}$