Page 27 - 01-Yr5_Front cover-ccp.indd

A probability line can be used to show how likely an event is to happen
It is usually numbered from O to 1 , but this one shows percentages.
0% 25% 60% 75% 100%
Impossible even chance certain
Work with a friend if you like.
• Cut out the statement cards on RM 26.
• On a long strip of paper, make a probability line like the one below.
• Decide where an the scale is the most sensible position for the statements.

DJ

Practical: make 5 'spinners'.
• Complete each statement card by writing the probability
of each event occurring as a percentage.
You may be able ta do this exactly,
or you might have to estimate.
a Open: colour spinner so there is
CHALLENGE
• Design statement cards about future weather. an even chance of spinning red
• Estimate the probability of the statement
becoming true.
or yellow. Possible solutions: any
arrangement with 4 each of red
and yellow.
b Open: colour spinner so there is
DJ an equal chance of spinning
yellow, blue, white or purple.
Practical: cut out cards from Resource Master 26. Open: colour spinner in own way
Possible solutions: any
and write about the chances of
arrangement with 2 each of all 4
spinning each colour.
colours.
Practical: make a probability line. c Open: colour spinner so there is
twice as much chance of
Draw a probability line for each spinning white as red or black.
spinner. Different answers are Possible solutions: any
Open: decide where to put the statements on the probability line. possible but they should have these arrangement with 4 white, 2 red,
fractions: 2 black.
Spinner A: red and yellow are both
~ (1-) d Open: colour spinner so there is
Open: write the probability of each statement as a percentage on the 8 2 an equal chance of spinning red
Spinner B: yellow, blue, white and
card. purple are all } ( i) or white, twice as much chance
Spinner C: white t (t), red i (t), of spinning yellow as red or
Challenge white, and twice as much chance
black 2- ( l )
4 of spinning blue as yellow.
2 l
B
·
.
Open: design statement cards about future weather and estimate their Spinner D. blue (2), yellow ( ), Possible solutions: any
4 I
probability. red t , white t 8 8 4 arrangement with 4 blue, 2
Spinner E: open yellow, 1 red and 1 white.