(a)[1]
Find the number of red pegs in the bag.
(b)[2]
Extra red pegs are added to the bag. Work out how many red pegs must be added to the bag so that the probability of selecting a blue peg is $0.2$.
Mathematics 4024 · O Level · Introduction to probability
Introduction to probability — practice question
A bag holds red and blue pegs. There are $40$ pegs altogether in the bag. The probability of picking out a red peg from the bag is $0.4$.