Tiffany has white and black shoes in her shoe box. The probability of her pulling out a white pair of shoes is 2/5 . What is the chance of Tiffany randomly pulling out a black pair of shoes?
Since the total probability of pulling out either a white or black pair of shoes must equal 1, and the probability of pulling out a white pair of shoes is 2/5, the probability of pulling out a black pair of shoes can be calculated as follows:
Total probability = 1
Probability of white shoes = 2/5
Probability of black shoes = 1 - Probability of white shoes
Probability of black shoes = 1 - 2/5
Probability of black shoes = 5/5 - 2/5
Probability of black shoes = 3/5
Therefore, the probability of Tiffany randomly pulling out a black pair of shoes is 3/5.