Probability Tes...

For a biased die the probabilities for different faces to turn up are given below
The die is tossed and you are told that either face 1 or 2 has turned up. Then the probability that is face 1 is

In a certain town, 40% of the people have brown hair, 25% have brown eyes and 15% have both brown hair and brown eyes. If a person selected at random from the town, has brown hair, the probability that he also has brown eyes is

In an entrance test there are multiple choice questions. There are four possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then the probability that he was guessing is

A coin is tossed three time in succession. If E is the event that there are lease two heads and F is the event in which first throw is a head, then P(E/F) =

A signal which can be green or red with probability 4/5 and 1/5 respectively, is received by station by station A and then transmitted to station B. The probability of each station receiving the signal correctly is ¾. If the signal received at station B is green, then the probability that the original signal was green is

Two cards are drawn one by one from a pack of cards. The probability of getting first card an ace and second a colored one is (before drawing second card first card is not placed again in the pack)