4. Jane is running a game in a school fete. She is using six cards. A whole number is written on each card. The cards are turned face down and one is selected at random. A player wins the game if an odd number is selected.
(a) Write a number on each card so that the chance of losing is the same as the chance of winning. [1]
(b) Explain how Jane could change the numbers on the cards so that the chance of losing is greater than the chance of winning. [1]
Mark scheme (a)
Scheme
Marks
Comments
Complete the cards with 3 odd and 3 even numbers.
B1
Mark scheme (b)
Scheme
Marks
Comments
Explains that there needs to be more even numbers than odd, e.g. ‘change one of the odd numbers for an even number’.
E1
Allow explaining by giving an example or demonstration, including reference to 'their (a)'
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