Worksheets › Class 9 › The Mathematics of Maybe: Introduction to Probability
Class 9 The Mathematics of Maybe: Introduction to Probability worksheet
CBSE Mathematics. Coins, dice, cards and balls; complementary events. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
A die is thrown once. The probability of getting an odd number is:
- 1/4
- 1/2
- 1/3
- 2/3
Answer
(b) 1/2
3 favourable outcomes out of 6
- 2.
Two coins are tossed together. The probability of getting at most one head is:
- 3/4
- 1/4
- 3/8
- 3/5
Answer
(a) 3/4
outcomes HH, HT, TH, TT: 3 favourable
- 3.
A bag has 14 red, 14 blue and 10 green balls. One ball is drawn at random. The probability that it is blue is:
- 15/38
- 7/38
- 7/19
- 12/19
Answer
(c) 7/19
14 blue out of 38
Section B · short answer
- 4.
A box has discs numbered 1 to 60. One disc is drawn at random. Find the probability that its number is a prime number.
Answer
17/60
17 such numbers from 1 to 60
- 5.
All the spades are removed from a deck of 52 cards. One card is drawn from the rest. Find the probability that it is a face card.
Answer
3/13
39 cards are left, and 9 of them are face cards
Section C · long answer
- 6.
In a lucky draw there are 750 tickets, of which 9 carry a prize. Dev buys one ticket. Find the probability that Dev wins a prize, and that Dev does not.
Answer
3/250; 247/250
9 out of 750; 1 − 3/250
Fresh sheets for your child
In the app, every The Mathematics of Maybe: Introduction to Probability sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.