Year 8 - Probability Exercise 1 Again, work out the probabilities of the following, but you now no longer need to list the outcomes, merely count them. Num Num Probability Event The set of all possible outcomes is known as the ___________________. matching outcomes outcomes 1 Drawing a Jack from a 4 52 List out all the possible outcomes each description, underline or circle the outcomes pack of cards. that match, and hence work out the probability. 2 Drawing a club from a pack of cards. Event Sample Space Probability 3 Drawing a card is 1 Getting one heads and HH, HT, TH, TT either a club or is an even one tails on the throw number. of two coins. 4 Throwing two sixes on a 2 Getting two after die in a row. two throws. 5 Throwing an even number on a die 3 Getting at least 2 followed by an odd heads after 3 throws. number. 4 Getting exactly 2 6 Throwing three square heads after 3 throws. numbers on a die in a 5 Rolling a prime row. number and throwing 7 Seeing exactly two heads a head. in four throws of a coin. 6 In three throws of a 8 Seeing the word ‘BOB’ coin, a heads never when arranging two plastic Bs and an O on a follows a tails. sign. 7 For a randomly chosen Seeing the word SHELL  meal with possible when arranging a letter starters Avacado, S, H, E and two letter Ls Beans and Cauliflower, on a sign. and possible main After shuffling a pack of  courses Dog, Escalopes cards, the cards in each or ending up with Fish, suit are all together. neither Avacado nor Dog. Exercise 2 Exercise 3
Year 8 - Probability Exercise 1 The set of all possible outcomes is known as the ___________________. List out all the possible outcomes each description, underline or circle the outcomes that match, and hence work out the probability. Event Sample Space Probability 1 Getting one heads and one tails on the throw of two coins. HH, HT, TH, TT 2 Getting two after two throws. 3 Getting at least 2 heads after 3 throws. 4 Getting exactly 2 heads after 3 throws. 5 Rolling a prime number and throwing a head. 6 In three throws of a coin, a heads never follows a tails. 7 For a randomly chosen meal with possible starters Avacado, Beans and Cauliflower, and possible main courses Dog, Escalopes or Fish, ending up with neither Avacado nor Dog. Exercise 2 Again, work out the probabilities of the following, but you now no longer need to list the outcomes, merely count them. Event Num matching outcomes Num outcomes Probability 1 Drawing a Jack from a pack of cards. 4 52 2 Drawing a club from a pack of cards. 3 Drawing a card is either a club or is an even number. 4 Throwing two sixes on a die in a row. 5 Throwing an even number on a die followed by an odd number. 6 Throwing three square numbers on a die in a row. 7 Seeing exactly two heads in four throws of a coin. 8 Seeing the word ‘BOB’ when arranging two plastic Bs and an O on a sign.  Seeing the word SHELL when arranging a letter S, H, E and two letter Ls on a sign.  After shuffling a pack of cards, the cards in each suit are all together. Exercise 3
Yr8-ProbabilityPack.docx