Worked example 4 Karla spins the pointer on this spinner. All sections of the spinner are equal in size. (i) List the possible outcomes. (ii) Find the probability that the pointer lands on: (a) black
(b) red Solution
(i) (ii)
(b)
(c) (d)
(c) not yellow (d) blue
Practice questions 6.2
1. A paper bag contains 3 green tiles, 2 yellow tiles and 1 blue tile. Liz draws a single tile without looking. (i) List the possible outcomes. (ii) What is the probability that the tile is …? (a) green
(c) blue
(b) yellow (d) pink
2. Shauna rolls a standard die, numbered 1 to 6. (i) List the possible outcomes. (ii) What is the probability of each of the following outcomes? (a) 1 (b) An even number (c) A prime number
(d) A number less than 5 (e) A positive integer
3. A jar contains 9 black, 22 red, 26 orange and 13 green marbles.
A marble is picked at random and its colour is recorded.
(i) List all the possible outcomes.
(ii) What is the probability of choosing …?
(a) a green marble (b) a black marble (c) a yellow marble (d)
4. This table shows the number of birthdays each month for a fi rst-year class. Month
Number of students
January February March April 2
4 3 2
May 5
any colour marble except for red
June 8
(iii) The student does not have a birthday in August
July August 5
3
A student is picked at random. What is the probability of each of the following events? (i) The student has a birthday in March (ii) The student has a birthday in June
Section A Introducing concepts and building skills