ratio and probability revision cards

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ratio

£10 is shared between 3 people with the ration 2:1:2

2+1+2=5 

10(divided by)5=2

each portion is worth £2 

2x2=4

2x1=2

2x2=4

4+4+2=10 

so 2 people end up with £4 each and 1 other person gets £2 

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ratio image

Ratio

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probability

What is probabilty?

Probability is the chance or likelihood that something will happen. All probabilities lie between th numbers from 0 to 1.

Exhaustive events account for all possible outcomes e.g

When 2 coins are tosed simultaneously the possible out comes are..

hh, tt, ht, th h=heads t=tails

Mutually exclusive events are events that cannot happen at the same time.

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probability example

John has a bag of jelly babies. In his bag he has 5 red, 7 green and 6 yellow jely babies. John picks a jelly baby at random. What is the probability tat he will pick...

a) a red jelly baby

b) a yellow or red jelly baby

a) p=5/18 We got this answer as we know by adding the total no. of jelly babies in his bag together we get 18, and 5 out of this 18 are red so the probability that he will pick a red jelly baby is 5 out of 18 which is written as 5/18.

b) p (red or yellow) = 11/18

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