Question

A bag contains 9 blue coins and 3 red coins. A coin is removed at random and replaced by three of the

other color.
Part 1 out of 3
What is the probability that the removed coin is blue? Enter your answer as a simplified fraction.
The probability that the removed coin is blue is

Answer 1

a)0.57

b)0.56

c)0.31

Explanation:

a) There are a total of 14 coins in the bag initially, of which 8 are blue, therefore:

b) After removing one blue, there are 7 blue coins and 6 red coins, to which 3 more red coins are added, making it a total of 9 red coins. That is a total of 16 coins, therefore:

c)After removing one red from the initial scenario, there are 8 blue coins and 5 red coins, to which 3 blue coins are added. That makes a total of 16 coins of which 11 are blue, and 5 are red, therefore: