Events and probability
Answers are for parents and teachers.
1
Classify as certain, impossible or random: a) the first person to enter the school door is a girl; b) a random number from 1 to 10 equals 11.
a) random; b) impossible.
2
Cards are numbered 1 to 12. Find the probability of drawing an even number.
1/2
3
A box has 3 red, 5 yellow and 2 green balls. What is the probability of drawing a ball that is not green?
4/5
4
Give an example of two incompatible events using a die.
For example: “1 point” and “5 points”.
5
Why can P(A) not equal 3/2?
3/2 > 1, but a probability lies between 0 and 1.