Math 30-2

Unit 4: Probability

Lesson 2: Odds and Probability

I need a solution for these questions please. their will be a answer key after the questions below that my teacher gave it to me. thank you

1. A package of 30 balloons has 17 that are red. If Dylan chooses a balloon at random,

determine:

a) the probability that the balloon is red.

b) the odds in favour of the balloon being red.

c) the odds agains the balloon being red.

2. Neave conducted a survey of students in grade 12 and found that 49% of them regularly

drove to school. Determine

a) the odds in favour of a randomly chosen student regularly driving to school.

b) the odds agains a randomly chosen student regularly driving to school.

3. Three students, David, Sarah and Aniela, are running for school president. A survey has

shown that David has a 35% chance of being voted president and Sarah has a 25% chance.

Determine, in simplest form,

a) the odds in favour of David being voted president.

b) the odds against Sarah being voted president.

c) the odds against Aniela being voted president:

answer key

1. a) 17/30, b) 17:13, c) 13:17

2. a) 49:51, b) 51:49

3. a) 7:20, b) 4:1, c) 5:2