Probability 1

PROBABILITY - the measure of how likely it is that an event will happen

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1. If one lolly is taken out of the packet without looking, what colour is it most likely to be?

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• Put the lolly colours in order from most likely to least likely to be chosen

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Probability 2

Sonnia puts 4 green and 6 red balls in a bag.

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a) Sonnia thinks she has more chance of getting a red ball out of the bag than a green one. Why might Sonnia think this? Do you agree?

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b) Sonnia took one ball out. She recorded its colour and then put it back. She did this ten times.

��Are these results possible or do you think Sonnia has �recorded them incorrectly? Give a reason.

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c) Sonnia repeats her ten picks. These are her results. Sonnia thinks she should get these results every time because there are 4 green and 6 red balls in the bag. Is she correct? Explain.

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d) If Sonnia took a ball out another ten times would she get the same result as she did in part c?

Probability 3

Fractions from 0 to 1 are used to describe the possibility of an event happening.

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A probability scale with IMPOSSIBLE (0) at one end and CERTAIN (1) at the other end

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Impossible Unlikely Even Chance Likely Certain

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0 1 1

(0%) 2 (100%)

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3. Mark the probabilities with an arrow/letter on the above scale of the following events:

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A When a fair dice is rolled it will land on an even number

B When a dice is rolled it will land on 7

C When 5L of water is poured into a 3L pot, non-stop, it will overflow

D The next baby born in the world will be a girl

E When a coin is tossed it will land on heads

F When a card is picked from a pack of playing cards, it will be a diamond

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4. Make a statement of your own. Call it G. Put G on your probability scale above

Probability Scale

Probability 4

5. Caleb has a choice of 3 main courses and 2 desserts.

1. Finish the tree diagram to show all his possible outcomes.

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b) How many different choices could Caleb make for his two courses?

MENU

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Mains

pizza(p)

fish and chips(f)

salad (s)

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Desserts

icecream (i)

pancakes (pc)

pizza

Probability 5

Six schools from East Tamaki will play each other in a soccer competition. �Each school plays the others schools once.

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Use a table or a diagram to work out the total number of games played.

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Ask your teacher for a piece of A4 paper.

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School Soccer

Competition

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Pt England School

Glen Taylor School

Tamaki Primary

Stanhope School

Bailey Road School

Sylvia Park School

Insert a table or diagram (or image of your working out) into this box