Probability - Home

Alien
Encounters!
A visit from aliens is highly unlikely—but
it could happen!
Use your imagination and your knowledge of
probability to answer these questions.
One afternoon, a fleet of spaceships is hovering
above your schoolyard.
As the spaceships touch down, small faces peer out
through the windows. Each face is green or purple,
has 3, 5, or 8 eyes, and is shaped like a triangle
or a hexagon.
1. How many different face types might you see?
Use a table or a tree diagram to explain
your thinking.
2. You are one of 40 students and 10 teachers
who rush out to greet the aliens.
Who will approach the spaceships?
To decide, names are put in a hat.
One name will be drawn.
What is the probability of each outcome?
a) A student will be chosen.
b) You will be chosen.
The aliens are playing a game with a spinner
and a number cube. The cube is numbered 1 to 6.
The spinner has 4 equal sectors, labelled 1 to 4.
Each player writes down a number between 0 and 5.
He or she then rolls the cube and spins the pointer.
The lesser number is subtracted from the
greater number.
To win, the difference must equal the number
the player wrote.
384
Unit 11