There are 25 red balls, 42 blue balls and 33 yellow balls in a bag. Kiran mixes the balls thoroughly inside the bag and then picks a ball at random from the bag. What is the probability that Kiran picks a blue ball?
For an event E,
P(E)=Number of favourable outcomes Number of all possible outcomes
There are 42 blue balls in the bag. Thus, the number of favourable outcomes is 42.
Total number of balls inside bag = 25 + 42 + 33 = 100
Thus P(picking blue ball) =42100=0.42