Probability
1. (2 marks) state the probability of two out of five" as a decimal and as a percent.
2. (1 mark) a six-sided cube numbered from 1 to 6 is rolled. state the probability that a number of 4 or less
(1, 2, 3, 4) will be rolled.
3. (2 marks) josephine has placed 3 white, 5 blue and 6 purple marbles in a bag.
a. state the probability of randomly selecting a purple marble from the bag.
b. a purple marble is pulled out of the bag and not replaced. state the probability of randomly
selecting another purple marble from the bag.
(1 mark) state the odds in favour of a tidal wave occurring given that the probability for this event is 3 out
of 147.
5. (1 mark) a group of 30 students were given 4 choices and asked to choose their favourite colour. the
results were as follows:
red
yellow
blue
12
green
3
|
19
the teacher states, “if i choose a student at random, there is a 25% probability that their favourite colour
is green.
the teacher's claim is an example of theoretical probability. justify (explain) the teacher's claim.