3 Marks Each
1. A bag contains 5 white and some blue balls. A ball is drawn at random. If the probability of drawing a blue ball is twice as that of getting a white ball, then find the probability of drawing a blue ball. Find the number of blue balls.
2. The faces of a die bear numbers 0, 1, 2, 3, 4, 5. If the die is rolled twice, then find the probability that the product of the digits on the upper face is zero.
3. A missing helicopter is reported to have crashed somewhere in the rectangular region shown in the figure. What is the probability that it crashed in the lake shown in the figure?
(The dimensions are suitably changed)
4. Three horses A, B and C are in a race. A is twice as likely to win as B and B is twice as likely to win as C. What are their probabilities of winning?
5. A bag contains 8 red and some blue balls. One ball is drawn at random. The ratio of the probabilities of drawing a red and blue ball is 2 : 5. What is the probability of drawing a blue ball? What is the number of blue balls?
This page was last modified on 22 March 2021 at 15:08