Anonymous
Anonymous asked in 科學及數學數學 · 10 years ago

# [數學]機會率問題

Suppose that a bag contains 10 coins: 4 are fair, 3 are biased with probability of heads 1/3,

and 3 have heads on both sides. A coin is chosen at random from the bag and is then tossed.

(1) Find the probability that a tail is observed;

(2) Given that a tail is observed, find the probability that the chosen coin was a fair one.