probability

• this is a probability tree diagram where everything has a 50 percent chance. the chance of getting a head and tail is 0.25 or 25%

  
• this diagram is similar but for blue the first choice is 7/15 therefore the second choice must total 15/15 so it has to be 6/15 because together with 7/15 they total 1 whole.

  
• for this every number in blue has to be filled in for the question. if there is 30 people and 16 boys there must be 14 boys because 14+16=30.

  
• What is the probability of selecting a vowel at random from the word PROBABILITY?

  4/11
• If the probability the team wins is 0.5 and the probability it draws is 0.2 then the probability of it losing must be 0.3. why?

  this is because probabilities must total 1
• what do probabilities total

  1
• A bag contains 12 counters of different colours: 5 red, 4 white and 3 black. Find the probability of not selecting a red counter.

  7/12