題組內容
八、Bowl B₁ contains 2 white chips, bowl B₂ contains 2 red chips, bowl B₃ contains 2 white and 2 red chips, and bowl B₄ contains 3 white chips and 1 red chip. The probabilities of selecting bowl B₁, B₂, B₃, or B₄ are 1/2, 1/4, 1/8, and 1/8, respectively. A bowl is selected using these probabilities, and a chip is then drawn random. Find
(b) \( \mathrm{P(B_1|W)} \), the conditional probability that bowl \( \mathrm{B}_1 \) had been selected, given that a white chip was drawn. (5%)