Browse Combined events & tree diagrams

44 questions at your level

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Tree diagrams & independent events

17 questions

LessonNot started
A bag has 33 red and 22 blue counters. A counter is taken, its colour noted, and it is put back. A second counter is taken. Write down the probability that the second counter is blue.
●●●●●Level 11 markStart
The probability that Ana is late on any day is 0.20.2, independently of other days. Work out the probability that she is late on both Monday and Tuesday.
●●●●●Level 11 markStart
A fair coin is flipped twice. Use a tree diagram or a list to find the probability of getting a head then a tail.
●●●●●Level 12 marksStart

Probability without replacement

17 questions

LessonNot started
A box has 44 red and 66 green pens. One pen is taken and not put back. It is red. Write down the probability that the next pen taken is also red.
●●●●●Level 11 markStart
There are 1010 cards numbered 11 to 1010. A card is taken and not replaced; it is the 77. Write down the probability that the next card taken is an even number.
●●●●●Level 11 markStart