Tree diagrams

1.    Anna and Bill are set to fail their maths exam because they are not good attenders at school. On a particular day:
P(Anna attends school) =  3/5
P(Bill attends school) = 7/10

Which is the correct representation of the below events as a tree diagram?

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Anna and Bill are set to fail their maths exam because they are not good attenders at school. On a particular day:

P(Anna attends school) = 3/5

P(Bill attends school) = 7/10

Find the probability that both of them attend school.

• 14/50

• 10/50

• 21/50

• 6/50

Anna and Bill are set to fail their maths exam because they are not good attenders at school. On a particular day:

P(Anna attends school) = 3/5

P(Bill attends school) = 7/10

Find the probability that at least one of them attends school.

• 21/50

• 44/50

• 6/50

• 14/50

1. There are 6 red and 3 white discs in a bag. A disc is drawn, then replaced and another disc is drawn.

Find the probability that both discs are red in colour.

• 1/9

• 4/9

• 5/9

• 2/9

There are 6 red and 3 white discs in a bag. A disc is drawn, then replaced and another disc is drawn.

Find the probability that the two discs are different colours.

• 4/9

• 2/9

• 1/9

• 5/9

There are 6 red and 3 white discs in a bag. A disc is drawn, then replaced and another disc is drawn.

Find the probability that both discs are the same colour.

• 5/9

• 4/9

• 2/9

• 1/9