(a) The probability scale shows the probability that a spinner will land on red. It also shows the probability that the spinner will land on blue.Tony says the spinner is more likely to land on blue than on red. Is he right? Explain your answer. (1)
(b) There are 3 white counters and 4 black counters in a box. Jenny is going to take at random a counter from the box.
(i) Write down the probability that Jenny will take a black counter.
(ii) Write down the probability that Jenny will take a yellow counter. (2)
Mark scheme (a)
Answer
Mark
Notes
No + reason
1
B1 for no and the (prob.) of red is (bigger than the (prob.) of blue. OR (prob.) of blue is nearer 0 OR (prob.) of red is closer to 1 OR (prob.) of red is 50% and the (prob.) of blue is about 20% oe
Mark scheme (b)
Answer
Mark
Notes
(i) \(\frac{4}{7}\) (ii) 0
2
(i) B1 for \(\frac{4}{7}\) oe (ii) B1 for 0 or \(\frac{0}{7}\) or 0% (accept 0 out of 7, but not 0:7 or 0 to 7)
